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The Best Free Firefox Add-ons & Plugins app downloads for Mac: Web Video Downloader for Firefox MetaCert Facebook Layouts CouponCabin Sidekick for Fir. Find the preference dom.ipc.plugins.sandbox-level.flash and double-click it click the Edit button. Enter an integer value of 0 (zero) and click OK on the checkmark to save the change. Quit and reopen Firefox so that the change will take effect.

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Mozilla's Firefox browser is known for its speed and a large collection of extensions that let you customize the experience to your heart's desire. But when Firefox is running slow, crashing, or not loading websites properly, it can be frustrating to figure out why. Follow our step-by-step guide to get your Firefox back to tip-top condition.

What are the most frequent problems with Firefox?

Overall, Firefox is a top-rated and highly reliable browser — good choice for both professional and everyday users. However, serving so many platforms on so many devices and screens, even the best of the best sometimes let us down. But worry not, in this how-to we've combined the most frequently occurring Firefox problems and written specific instructions on how to fix them.

The remote Mac OS X host contains a web browser. (Nessus Plugin ID 55417).
Functions can be added through add-ons, created by third-party developers, of which there is a wide selection, a feature that has attracted many of Firefox's users. Mozilla Firefox is a cross-platform browser, providing support for various versions of Microsoft Windows, Mac OS X, and Linux. Firefox Features. Improved Tabbed Browsing; Spell Checking.

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Why is Firefox so slow, hangs or keeps freezing?

Slow Firefox browsing experience is truthfully beyond annoying. It seems like it's almost working, but you can't get anything done.

Here we've listed some suggestions that should get your Firefox run faster.

1. Close inactive tabs

See how many tabs you have opened. More than a few? Active tabs mean active processes that take up your laptop's RAM and drastically slow down its capabilities. Just close the tabs you're not actively using. If they are important to remember, save them to bookmarks or stash them in a special 'Read Later' list in a to-do application such as 2Do.

2. Clear Firefox cookies and cache

All the websites you visit leave behind cached image files, which are supposed to speed up load times, and cookies, which can save you from having to log in over and over. Those are big conveniences if they work the way they're supposed to, but sometimes cache and cookies can cause glitches and slowdowns.

If Firefox is acting up, you can clear cookies and cache by doing the following:

Click the Library button
Choose History > Clear Recent History
Change the time range to Everything
Click the arrow next to the word Details
Select Cache and Cookies
Then click the Clear Now button

Alternatively, you can do this easier and safer with CleanMyMac. Just click Privacy in the sidebar and then choose Firefox from the list. Change the time range to Everything, and you can clear all of the cookies, browsing history, downloads history, tabs, saved passwords, and even autofill values.

3. Update Firefox and macOS

If closing tabs and clearing the cache didn't work, it's a good idea to update Firefox and macOS to its latest versions. When Firefox is active, just click on Firefox in the menu and select About Firefox. The latest available update should start downloading automatically. When it's ready, click Restart to Update Firefox and you are ready to go.

Updating macOS is easy too. Just launch the App Store on your Mac. Go to the Updates tab and wait till it shows you all the new software versions available. If you see new updates for macOS, click Update and follow the restart instructions.

4. See what consumes hardware resources

If the problem persists, check for high hardware resource usage. For basic information, you can use Mac's native Activity Monitor. However, to see the whole picture, get a pro-level app, such as iStat Menus. If you see Firefox using too much memory or CPU, you need to take some action.

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5. Troubleshoot plugins and extensions

When Firefox stops responding to your clicks it's very likely that one of your installed plugins is the culprit. To check for that, click the Menu button, and then choose Add-ons. In the Add-ons Manager's Plugins panel, you can select Never Activate for each plugin, then restart Firefox and see if the problem is still happening.

If the problem is gone, turn the plugins back on one by one, just changing that Never Activate option back to Always Activate. Restart Firefox each time and then try to recreate the error. Once the problem reappears, you'll know it was likely caused by the last plugin you re-enabled.

You can also remove a plugin with CleanMyMac's Extensions tab, which is actually a lot easier than using Firefox. In Firefox itself, you have to type about:plugins, then find the file path for that plugin and navigate to it in the Finder. Mozilla then recommends you change the filename to add an X in front, which will remove the plugin. You can reinstall a fresh copy of the plugin (from official sources only!), or just see if you can live without it.

To check your extensions in Firefox, go to about:add-ons, then click Extensions in the sidebar. You can disable extensions here, and then turn them back on one by one, in the same way you just checked your plugins. If you want to remove all your extensions and start fresh, you can click the Remove button or use the Extensions tab in CleanMyMac, which manages extensions, add-ons, and plugins from one place.

6. Stop loading Flash content

Preventing Flash content from loading automatically deserves a separate explanation. Some websites use way too much Flash content, and loading and playing all of that uses up your computer's resources, especially if you keep a lot of tabs open. Luckily, you can tell Firefox to stop loading Flash content by default, until you ask for it.

Click the Menu button and select Add-ons, or select Tools > Add-ons from your Mac's menu bar. (Or press Command-Shift-A, or type about:add-ons into the URL bar. It all takes you to the same place.)
In the Add-ons Manager, click Plugins in the sidebar, and then look for Shockwave Flash.
Change the dropdown from Always Activate to Ask to Activate. After that, websites will display an Activate Adobe Flash button in place of Flash content, and all you have to do is click that to allow Flash to display it.

Following the tips above should eliminate 90% of your Firefox problems. But if you're still experiencing troubles, there is more you can do. Read on.

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Mozilla Firefox crashes unexpectedly or won't open

Whether Firefox shows you an error message every time you try to launch the app or right when you're in the middle of a working session, there is only one way to fix that — reinstall the application.

The easiest way to reinstall Firefox is to quit it, delete the Firefox file from your Applications folder, and download the new version from the official Mozilla website. That will uninstall the application but keep all your user data intact, and when you reinstall a new copy, you bookmarks and passwords will still be there.

But that's not the best way to do it, since Firefox leaves all kinds of data on your hard drive besides the main application file. A better way is to use an application that's able to delete all Firefox information completely or simply reset the app, such as CleanMyMac.

To reset the Firefox browser app on mac:

Launch CleanMyMac
Go to the Uninstaller tab
Choose Firefox from the list
Choose Application reset and click Uninstall round button

There are rare cases when the 'Firefox quit unexpectedly' message could be caused by the Mac security update. This happens when your Mac's firewall used to recognize previous versions of Firefox but no longer trusts the new one. Follow official Mozilla documentation to fix this issue.

Firefox shows errors loading websites

So your Firefox is fast and doesn't randomly quit, but still doesn't seem to load websites. There are a few things that might cause this, so let's zero in on the problem by gradually excluding various perpetrators.

1. Check your network connection

Turn your modem off and on (helps in nearly all cases). Check that your network connection is performing up to standards by using WiFi analyzers, such as NetSpot and WiFi Explorer. As soon as you launch NetSpot, make sure it's set to Discover mode, and it will scan all nearby WiFi networks automatically. WiFi Explorer is just as easy — launch the app and click the play button to analyze the network quality around you.

2. Launch websites in other browsers

If your WiFi network seems to be fine, it's good to check whether the connection works in other browsers, like Safari or Chrome, just to make sure that the problem in fact is with Firefox specifically. Then, check the settings in your firewall by following the steps outlined by Mozilla.

3. Fix the proxy server issue

If upon loading the website you get the 'Proxy server is refusing connections' message, there is an easy fix for that.

Open Firefox > Menu > Options
In the Options, click Advanced and then Network
Choose Settings and then 'No proxy' and click OK
Restart Firefox and the problem should be fixed

4. Validate the security certificate

In case Firefox shows you that it has troubles validating some website's security certificate, it might be related to improperly set date and time on your system. Just make sure your timezone settings in System Preferences > Data & Time are configured correctly and Firefox should go back to validating the website certificate normally.

5. Flush DNS cache

Another option you can try is flushing the DNS cache, which acts as a temporary database, storing all sorts of connectivity logs and website access attempts.

Open up the Terminal utility
Type sudo killall -HUP mDNSResponder;say DNS cache has been flushed
Press Enter and type your admin password when prompted
An alert a few moments later will inform you that the process is complete

Combine flushing the DNS cache with clearing out cache and cookies from Firefox, and restarting your Mac to get the best result.

6. Disable DNS prefetching

If you are still experiencing troubles loading websites, it could be that DNS prefetching is at play. Usually Firefox tries to speed up loading new websites by using DNS prefetching, but it can also cause loading errors with some system configurations. To disable DNS prefetching:

In the address bar, type about:config and press Return. The about:config 'This might void your warranty!' warning page may appear. Click 'I accept the risk!' to continue.
Hold down the Ctrl key while you click on the list of preferences. Select New and then select Boolean.
In the 'Enter the preference name' field, enternetwork.dns.disablePrefetch and click OK.
Select True when prompted to set the value and click OK.

7. Scan your Mac for malware

The last step to try to fix the website loading issue is to check your system for malware. If you remember Firefox being haunted by ad pop-ups, toolbars you didn't install yourself, or a new default home page, you might have picked up some malware that's hijacking your browser sessions.

A simple malware tool for Setapp users is CleanMyMac Malware Removal tool. It's a free download, with a pro license for more active, real-time protection. The free product will however scan your Mac and safely remove any malware at no cost to you.

Firefox doesn't work as it should

When your Firefox is just generally behaving incorrectly, a few more tips might come in handy. Start with restarting your Mac, and then clear the cache and troubleshoot your plugins as described above.

1. Restart Firefox in Safe Mode

When clearing the cached data doesn't help, try restarting the browser in Safe Mode. This will temporarily turn off your extensions, as well as any extra themes and toolbars, and hardware acceleration. The easiest way to do this is to quit Firefox and restart it holding down your Mac's Option key.

If the problem you were having magically goes away in Safe Mode, then you can proceed to check your extensions, themes, and anything else you've added to Firefox. If you're still having the problem in Safe Mode, that's a sign you might need to just trash your copy of Firefox and start over with a fresh install.

2. Refresh Firefox

There is another clever feature inside Firefox that clears out your extensions and themes, plus resets all the preferences to default, but keeps your personal information intact, including bookmarks, history, open tabs and windows, saved passwords, autofill info, and even cookies.

Open Firefox, and type about:support in the URL bar, which takes you to the Troubleshooting Information page
You'll find a lot of information about your browser installation, as well as a big friendly Refresh Firefox button at the top-right
You can also get to Safe Mode this way, by clicking the button that says Restart with Add-ons Disabled

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3. Create a new Firefox profile

For times, when neither options fixed the problem, try creating a fresh Firefox profile, which won't have any of your bookmarks, passwords, and user preferences, but might get rid of the problem.

Open the Terminal utility
Type in /Applications/Firefox.app/Contents/MacOS/firefox-bin -P
Press Enter and the Profile Manager window should open
Click Create Profile… then Next and enter the name for the profile
Press Done

4. Turn off hardware acceleration

In cases when Safe Mode seemed to fix the problem but checking plugins didn't bring any result, the problem may hide in hardware acceleration, which is off by default in Safe Mode. Here's how to turn it off in the regular mode too:

Open Firefox > Preferences
In the General panel, scroll down to the Performance section and uncheck the box labeled 'Use recommended performance settings'
Uncheck another box named 'Use hardware acceleration when available'
Then quit and restart Firefox

There you go. About a dozens of apparent and not-so-apparent tips should bring your Firefox to the best shape possible. And even if you don't experience many troubles with Firefox, following some tips above would help you optimize its speed and responsiveness. Best of all, you don't need a lot of third-party tool to perform a thorough checkup, and all the tools you need are easily available on Setapp.

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Firefox Release Notes

Firefox 2 is the next-generation release of the award-winning Firefox web browser from Mozilla.

These Release Notes cover what's new, download and installation instructions, known issues and frequently asked questions for Firefox 2. Please read these notes and the bug filing instructions before reporting any bugs to Bugzilla.

Give us your feedback through this feedback form.

What's New in Firefox 2.0.0.8

Release Date:: October 18, 2007
Security Update:: The following security issues were fixed.
Mac OS X 10.5 (Leopard) Support:: Firefox 2.0.0.8 is compatible with Mac OS X 10.5, although there are some known issues affecting some media plugins.
New Languages:: Official releases for Georgian (ka) and Romanian (ro) are now available. Beta release for Kurdish (ku) is also available for testing.
Earlier Changes:: For information about previous changes, please see the Firefox 2.0.0.7 Release Notes.
Firefox 2 Features:: For an overview, please see Firefox 2 Features.

Downloading and Installing

System Requirements

Before installing, make sure your computer meets the system requirements.

Downloading Firefox 2

Mozilla provides Firefox 2 for Windows, Linux, and Mac OS X in a variety of languages. You can get the latest version of Firefox 2 here. For builds for other systems and languages not provided by Mozilla.org, see the Contributed Builds section at the end of this document.

Installing Firefox 2

Please note that installing Firefox 2 will overwrite your existing installation of Firefox. You won't lose any of your bookmarks or browsing history, but some of your extensions and other add-ons might not work until updates for them are made available.

Removing Firefox 2

You can remove Firefox 2 through the Control Panel in the Start Menu on Windows, by removing the Firefox application on OS X, or by removing the firefox folder on Linux.

Removing Firefox 2 won't remove your bookmarks, web browsing history, extensions or other add-ons. This data is stored in your profile folder, which is located in one of the following locations depending on your operating system:

Windows Vista	Users<UserName>AppDataRoamingMozillaFirefox
Windows 2000, XP, Server 2003	Documents and Settings<UserName>Application DataMozillaFirefox
Windows NT	WINNTProfiles<UserName>Application DataMozillaFirefox
Windows 98, ME	WindowsApplication DataMozillaFirefox
Mac OS X	~/Library/Application Support/Firefox
Linux and Unix systems	~/.mozilla/firefox

Any version of Firefox that you install after removing Firefox 2 will continue to use the data from this profile folder.

Extensions and Themes

Extensions installed under Firefox 1.5 may be incompatible and/or require updates to work with Firefox 2. Please report any issues to the maintainer of the extension. When you install Firefox 2 all of your Extensions and Themes will be disabled until Firefox 2 determines that either a) they are compatible with the Firefox 2 release or b) there are newer versions available that are compatible.

Known Issues

This list covers some of the known problems with Firefox 2. Please read this before reporting any new bugs.

All Systems

Some firewall software may silently block Firefox from running. This often happens immediately after Firefox has been installed or updated from a previous version. There are configuration instructions available for most popular firewall programs to help you ensure that Firefox is allowed to connect to the Internet.
Dictionaries for several locales can't be packaged with the builds, and must be manually downloaded by right-clicking in a text area and selecting 'Add Dictionaries...' from the shortcut menu. New dictionaries are regularly being added to Mozilla Add-ons, so if you don't see the particular dictionary you need, check back later.
Access key definitions provided by web pages can now be triggered using Alt+Shift+key on Windows, Ctrl+key on Mac OS X, and Ctrl+Shift+key on Unix.
The Session Restore functionality provided in Firefox 2 will restore connections to services which use session cookies to maintain login state such as GMail. It is recommended that users with concerns about the privacy implications of this behavior change the value of browser.sessionstore.resume_from_crash to false.
The option for 'Shrink to fit' has been removed in Firefox 2. If you wish to change this from the value you had set in your previous version of Firefox, change the value of browser.enable_automatic_image_resizing.
Software Update will not work if Firefox is installed to a location on your disk to which you do not have write access, since Software Update needs to replace or create files in this location.
Some financial institutions use port 563 for secure logins, which results in an error message. If you encounter this error, make sure that network.security.ports.banned.override includes 563 in the comma-separated list of banned network ports to override.
The CSS 'clear' element is sometimes ignored on pages with elements that use the 'float' element. There is a workaround available for web developers.
After updating, add-ons may become disabled and enter an endless loop of trying to update themselves. This can be fixed by removing some files from your profile directory.
Removing the 'area' element from image maps will result in the entire map disappearing.

Windows & Windows Vista

On Vista, Java applets will not work unless Firefox is 'Run as administrator' at least once after being updated.
The Java Console extension that came with Java SE 6.0u1 (J2SE6.0.01) is incompatible with Firefox as reported in Bugzilla. Java should work as expected, but the menu item 'Java Console' will not be available in the Tools menu. This issue has been fixed in Java SE 6.0u2 (J2SE6.0.02) and later versions and is available for download from the Java website.
Clicking links in some applications (e.g. some instant messaging programs) might not open them in Firefox, even if you have set it as your default browser. To workaround this problem, go to Start -> Default Programs -> Set default programs for this computer, expand custom, select the radio button next to the app you want to set as the system wide default app (e.g. Firefox, etc.), and apply.
A Windows Media Player (WMP) plugin is not provided with Windows Vista. As a workaround, in order to view Windows Media content, you can follow these instructions. Note that after installing you may have to get a security update and apply it before you can see the content in the browser.
Vista Parental Controls are not completely honored. In particular, file downloads do not honor Vista's parental control settings. This will be addressed in an upcoming Firefox release.
When migrating from Internet Explorer 7 to Firefox, cookies and saved form history are not imported.
Use of the install-global-extension and install-global-theme command line arguments have been restricted to only allow installing add-ons that are on local disks or mapped drives. Installing from a network share directly will no longer succeed.

Mac OS X

On OS X 10.5 (Leopard), there are known problems with some media plugins as well as Add-ons that contain binary components. Also, the tabs in Preferences > Advanced will not render properly.
The 'Close Other Tabs' action on the shortcut menu of a tab can fail with an error when more than 20 tabs are open.
Some users have reported problems viewing Macromedia Flash content on Intel Mac computers. To work around this problem, users can remove or move the PowerPC version of 'Flash Player Enabler.plugin from /Library/Internet Plug-Ins.
After installing a new plug-in, Firefox may continue to display information for the older version of the plug-in in about:plugins. If this happens, quit Firefox, delete the 'pluginreg.dat' file from your profile folder, and relaunch Firefox.
Java does not run on Intel Core processors under Rosetta.
There is no Talkback on Intel-based Macs when running natively or under Rosetta. The Apple Crash report program should launch in the event of application crashes.

Linux and Unix

If Firefox is installed to a location with spaces in the path, it may not be able to set itself as default browser and may keep prompting at startup. The work around is to install into a path without spaces.
GNOME integration does not work properly with Fedora Core 3. Users of Fedora Core 3 will need to download and install linc-1.0.3-3.1.i386.rpm. After installing the RPM, perform the following command in the directory in which you installed Firefox (you will need write permission):
touch .autoreg
The next time you start Firefox, GNOME integration should be functional.

Troubleshooting

Poorly designed or incompatible extensions can cause problems with your browser, including make it crash, slow down page display, etc. If you encounter strange problems relating to parts of the browser no longer working, the browser not starting, windows with strange or distorted appearance, degraded performance, etc, you may be suffering from Extension or Theme trouble. Restart the browser in Safe Mode. On Windows, start using the 'Safe Mode' shortcut created in your Start menu or by running firefox.exe -safe-mode. On Linux, start with ./firefox -safe-mode and on Mac OS X, run:
cd /Applications/Firefox.app/Contents/MacOS/ ./firefox-bin -safe-mode
When started in Safe Mode all extensions are disabled and the Default theme is used. Disable the Extension/Theme that is causing trouble and then start normally.
If you uninstall an extension that is installed with your user profile (i.e. you installed it from a Web page) and then wish to install it for all user profiles using the -install-global-extension command line flag, you must restart the browser once to cleanse the profile extensions datasource of traces of that extension before installing with the switch. If you do not do this you may end up with a jammed entry in the Extensions list and will be unable to install the extension globally.
If you encounter strange problems relating to bookmarks, downloads, window placement, toolbars, history, or other settings, it is recommended that you try creating a new profile and attempting to reproduce the problem before filing bugs. Create a new profile by running Firefox with the -P command line argument, choose the 'Manage Profiles' button and then choose 'Create Profile...'. Migrate your settings files (Bookmarks, Saved Passwords, etc) over one by one, checking each time to see if the problems resurface. If you do find a particular profile data file is causing a problem, file a bug and attach the file.

Frequently Asked Questions

What can I do to help?
We need help from developers and the testing community to provide as much feedback as possible to make Firefox even better. Please read these notes and the bug filing instructions before reporting any bugs to Bugzilla. You can also give us your feedback through this feedback form.
Why haven't you responded to the mail I sent you?
Use the forums. The Firefox team reads them regularly. We all get a lot of email and your email may get lost.
Where can I get extensions and themes (add-ons)?
Firefox Add-ons.
Who makes Firefox 2?
Lots of people. See Help->About Mozilla Firefox, Credits for a list of some of the people who have contributed to Firefox 2.
Where's the Firefox 2 source code?
A tarball of the Firefox 2 source code is available for download. The latest development code can be obtained by cvs. Firefox-specific source is in 'mozilla/browser', 'mozilla/toolkit', and 'mozilla/chrome'. Please follow the build instructions.
Where is the mail client?
Firefox 2 works with whatever mail client is the default on your system. However, we recommend Mozilla Thunderbird, our next-generation email client and the perfect complement to Firefox.

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