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.
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. VPN Unlimited for Mac works across all your devices, including Windows, Mac, Linux, iOS, Android and Windows Phone. It even includes browser extensions for Google Chrome and Mozilla Firefox, so you can experience total privacy anywhere, with unlimited browsing anytime.
Download Stealthy for Firefox - Ensure your identity is protected while surfing the web by resorting to this lightweight browser addon that hides your real location and unlocks restricted websites.
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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:
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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:
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.
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Note: You might want to print these steps or view them in another browser.
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.
Note: When you refresh Firefox, your bookmarks, browsing history, open tabs, windows, passwords, cookies and web form auto-fill information will be saved. However, your extensions and themes will be removed and your preferences will be reset. Learn more.
Note: There's a Refresh Firefox button in the Firefox Safe Mode window, if you can't start Firefox normally. You can also do a manual refresh by creating a new profile and transferring your important data to the new profile.
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:
Firefox 6.0 Download For Mac Windows 7Check browser internals
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.)
Troubleshoot the Flash plugin
See Flash Plugin - Keep it up to date and troubleshoot problems.
Check for conflicts with your Internet security software
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.
Check for malware
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.
Based on information from Standard diagnostic - Firefox (mozillaZine KB)
Wappalyzer is a free browser extension which detects and displays the technologies used on websites: servers, content management systems, eCommerce platforms, analytics tools, advertising frameworks and more.
The extension adds multiple icons to your address bar, each one representing a common web component (PHP, jQuery etc). Clicking Wappalyzer's own icon displays the full list of technologies, sometimes with their version numbers.
Clicking the name of any package displays some statistics about it: the total number of sites where it's been detected, the top ten of those sites, how its use has varied over time.
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If you're thinking that means Wappalyzer must send its detection results back to the developer, then you're right. This is done anonymously, though, so doesn't constitute any significant privacy risk, and if you're still unhappy then it's easy to disable (click the icon, select Settings, clear 'Anonymously send reports...').
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A handy tool for web developers, penetration testers, and anyone else who needs to know low-level server details
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