Download Mozilla Firefox, a free web browser. Firefox is created by a global not-for-profit dedicated to putting individuals in control online. Get Firefox for Windows, macOS, Linux, Android and iOS today! By default, Firefox is set to “Use system proxy settings”. No proxy: Firefox won’t use a proxy server, even if one is configured in your system-wide proxy settings. Auto-detect proxy settings for this network: Firefox will use the Web Proxy Auto-Discovery Protocol, also known as WPAD, to detect the appropriate proxy for your network.

Most problems with Firefox can be fixed by following the troubleshooting methods described below. Try these steps in order. If one doesn't work, move on to the next one. If you need extra help with any of this, we have a community of volunteers standing by.

8Other solutions

Sometimes problems can be fixed by simply restarting your computer and then starting Firefox again.

Many problems with loading web pages can be resolved by clearing Firefox's cookies and cache:

Click on the menu button to open the menu panel.Click the Library button on your toolbar. (If you don't see it there, click the menu button then click Library.)
Click History and select Clear Recent History….
In the Time Range to clear: drop-down, select Everything.
Below the drop-down menu, select both Cookies and Cache. Make sure other items you want to keep are not selected.
Click .

For more information, see Delete browsing, search and download history on Firefox.

Firefox Safe Mode is a troubleshooting mode that disables extensions, uses the default theme, turns off hardware acceleration and uses default toolbar settings, among other changes (see this article for details). To start Firefox in Safe Mode:

Click the menu button , click Help, select Troubleshoot Mode… and click in the Restart Firefox in Troubleshoot Mode? dialog.
Note: You can also start Firefox in Troubleshoot Mode by holding down the shift key while starting Firefox.holding down the option key while starting Firefox.quitting Firefox and then going to your Terminal and running: firefox -safe-mode
You may need to specify the Firefox installation path (e.g. /usr/lib/firefox)
Click the menu button , click Help, select Restart With Add-ons Disabled… and click in the Restart With Add-ons Disabled dialog.
Note: You can also start Firefox in Safe Mode by holding down the shift key while starting Firefox.holding down the option key while starting Firefox.quitting Firefox and then going to your Terminal and running: firefox -safe-mode
You may need to specify the Firefox installation path (e.g. /usr/lib/firefox)
In the next Firefox Safe Mode dialog, click .
Check whether your problem is still happening while in Safe Mode.

If the problem still happens in Safe Mode, go on to step 4.
If the problem does not happen in Safe Mode, follow these instructions to troubleshoot extensions, themes and hardware acceleration.

Firefox Troubleshoot Mode is a diagnostic mode that disables extensions, uses the default theme, turns off hardware acceleration and uses default toolbar settings, among other changes (see this article for details). To start Firefox in Troubleshoot Mode:

Firefox Firewall Access

Click the menu button , click Help, select Troubleshoot Mode… and click in the Restart Firefox in Troubleshoot Mode? dialog.
Note: You can also start Firefox in Troubleshoot Mode by holding down the shift key while starting Firefox.holding down the option key while starting Firefox.quitting Firefox and then going to your Terminal and running: firefox -safe-mode
You may need to specify the Firefox installation path (e.g. /usr/lib/firefox)
Click the menu button , click Help, select Restart With Add-ons Disabled… and click in the Restart With Add-ons Disabled dialog.
Note: You can also start Firefox in Safe Mode by holding down the shift key while starting Firefox.holding down the option key while starting Firefox.quitting Firefox and then going to your Terminal and running: firefox -safe-mode
You may need to specify the Firefox installation path (e.g. /usr/lib/firefox)
In the next Open Firefox in Troubleshoot Mode? dialog, click .
Check whether your problem is still happening while in Troubleshoot Mode.

If the problem still happens in Troubleshoot Mode, go on to step 4.
If the problem does not happen in Troubleshoot Mode, follow these instructions to troubleshoot extensions, themes and hardware acceleration.

Some Firefox issues can be caused by a problem with one of the Firefox program files. Follow these steps to completely remove and reinstall Firefox. This process will not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location.

Note: You might want to print these steps or view them in another browser.

Download and save the installer for the latest official version of Firefox from mozilla.org.
Exit Firefox (if open): Click the Firefox menu and select Exit.Click the Firefox menu at the top of the screen and select Quit Firefox.Click the Firefox menu and select Quit.
You may want to make a note of the Mozilla Firefox program folder location (right-click the Firefox desktop icon, select Properties from the context menu and click the Shortcut tab) since there may be leftover files and folders after you uninstall Firefox that should be removed for a clean reinstallation.
Uninstall Firefox from your computer.
Delete the Firefox program folder, which is normally found in one of these locations by default:
- C:Program FilesMozilla Firefox
- C:Program Files (x86)Mozilla Firefox
Reinstall Firefox using the installer you downloaded earlier - see How to download and install Firefox on Windows for instructions.

Download the latest official version of Firefox from mozilla.org.
Quit Firefox: Click the Firefox menu and select Exit.Click the Firefox menu at the top of the screen and select Quit Firefox.Click the Firefox menu and select Quit.
Uninstall Firefox from your computer by opening the Applications folder in the Finder and dragging the Firefox application to the Trash.
Reinstall Firefox - see How to download and install Firefox on Mac for instructions.

Download the latest official version of Firefox from mozilla.org.
Quit Firefox: Click the Firefox menu and select Exit.Click the Firefox menu at the top of the screen and select Quit Firefox.Click the Firefox menu and select Quit.
Uninstall Firefox - If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see Install Firefox on Linux for details. If you downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory to uninstall Firefox.
Reinstall Firefox - see Install Firefox on Linux for instructions.

Now start Firefox and check to see if your problem has been fixed. If it hasn't, continue with the next troubleshooting method.

The Refresh Firefox feature can fix many issues by restoring your Firefox profile to its default state while saving your essential information.

If you have many Firefox customizations, you may want to skip this step and create a new Firefox profile instead (see step 6, below) so that your old profile is easily recoverable from the Profile Manager.

Note: When you refr

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Firefox Firewall Access