File Size: Plugins which also support this rendering model can now draw faster and more efficiently Web developers can update the URL field without reloading the page using HTML History APIs More responsive page rendering using lazy frame construction Link history lookup is done asynchronously to provide better responsiveness during pageload CSS :visited selectors have been changed to block websites from being able to check a user's browsing history New HTML5 parser Support for more HTML5 form controls Web authors can now get touch events from Firefox users on Windows 7 machines A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code used for things like graphics and animations more efficiently.
Mozilla Firefox Comments. Upload Software Get points for uploading software and use them to redeem prizes! Click on the link labeled Set your default programs.
The Set your default programs panel will open. In the programs list on the left side of the window, click Firefox. In the right side of the window, click Set this program as default. On the left side of the window, click the Set Program Access and Defaults icon. Click on the Custom radio button to expand the Custom category. Underneath Choose a default Web browser click the radio button next to Mozilla Firefox. Click OK at the bottom of the window.
Note: If Firefox is not listed as a program choice, uninstall Firefox from your computer the uninstaller does not remove any user data such as history or bookmarks and then reinstall Firefox to see if that registers your Firefox web browser. On the Internet tab under Web Browser , choose Firefox in the drop-down. Press Close. Click on the html tab under text , choose Firefox in the menu, rise it to the top of the list. Press Apply.
Click on the Web Browser line on the list of displayed services and type firefox in the Default Component menu. Click General. Choose Firefox from the Default web browser drop-down menu. From Safari From the Dock, open Safari. To start Firefox in Troubleshoot Mode:. 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. Now start Firefox and check to see if your problem has been fixed. If it hasn't, continue with the next troubleshooting method. Sometimes files in your Firefox profile folder that correspond to the essential information that a Firefox Refresh doesn't remove such as bookmarks and browsing history may be causing the issue.
You can create a new, additional profile which will not contain any of your old Firefox data. See the Profile Manager - Create, remove or switch Firefox profiles article for instructions.
If you've tried all of these troubleshooting methods, and you're still having problems, here are some other solutions you can try:. The Firefox Task Manager about:performance page lets you see what tabs or extensions are slowing down Firefox. Telemetry Data shared with Mozilla about:telemetry page contains detailed data about performance, hardware, usage and customization. The Troubleshooting Information page about:support page includes other about: page links and troubleshooting resources.
For a list of all about: pages, enter about:about in the address bar. Some Internet security software including antivirus, antispyware, and firewall programs can cause problems with Firefox including blocking it from opening websites, crashes, and more.
Often you can open the program's settings, remove Firefox from its list of allowed or trusted programs, and it will be re-detected and things should start working again. If your program is listed at the Configure firewalls so that Firefox can access the Internet article, you can get specific instructions for how to properly reconfigure it. Malware short for "malicious software" can cause problems with Firefox.
Periodically, you should scan your system for viruses, spyware, or other malware. For more information, see Troubleshoot Firefox issues caused by malware. Grow and share your expertise with others. Answer questions and improve our knowledge base. Search Support Search. Home Firefox Fix slowness, crashing, Procedures to diagnose and
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