Mozilla Firefox Help

  All of your personal settings, bookmarks, and other information are kept in your  Firefox profile . Firefox needs an unlocked profile to start up, and if the profile is locked, it displays the message,  Firefox is already running, but is not responding . This article explains what to do if you see this message and how to prevent it from showing at startup.  Mozilla Firefox not Responding End Firefox processes If Firefox did not shut down normally when you last used it, Firefox might still be running in the background, even though it is not visible.  If you try to open it while it's running, an error message will appear with the option to click  Close Firefox . If that doesn't solve the problem, restart your computer or try the following options. Use the Windows Task Manager to close the existing Firefox process Right-click on an empty spot in the Windows task bar and select  Task Manager  (or press  Ctrl + Shift + Esc ). When the Windows Ta...

  Firefox includes a page with information such as which Firefox version you are using, any installed extensions, important modified preferences, and graphics information. If you are  getting help on the support forum , content that you provide from this  Troubleshooting Information  page can help solve your Firefox issue.  Mozilla Firefox Help Give Firefox a tune up The Refresh Firefox feature can fix many issues by restoring Firefox to its default state while saving your essential information. Consider using it before going through a lengthy troubleshooting process. Try Safe Mode You can restart Firefox in Safe Mode to temporarily turn off hardware acceleration, reset some settings, and disable add-ons (extensions and themes) that might be causing problems. See Troubleshoot Firefox issues using Safe Mode for more information. Try clearing the startup cache Firefox stores certain temporary data in a startup cache to improve startup...

  This article describes problems where Firefox cannot load websites but other Web browsers (such as   Internet Explorer ) can. When this happens, Firefox may show a   Server not found   or   Unable to connect   error message.  Fix Firefox Error For other error messages that display when you try to view websites in Firefox, see Websites don't load - troubleshoot and fix error messages. If none of the Web browsers on your computer can load websites, see Firefox and other browsers can't load websites.    Internet Security software blocking Firefox If you were able to load websites until you updated Firefox or until your Internet security software was updated, reconfigured or a new one was added, your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more) is likely preventing Firefox from connecting to the Internet. In general, you should make sure your Internet security software is up-to-...

  Many Windows users will agree that Mozilla Firefox is one of the best browsers for Microsoft’s operating system. However, like any other application, it is also susceptible to various issues. What if Mozilla Firefox won’t open? What if the browser’s too slow? In this article, we will discuss some of the common problems that people encounter when using Firefox. We will also teach you how to fix Firefox not responding and other issues that may prevent you from enjoying the browser’s full potential. Common Firefox Issues When it comes to solving problems, the best approach is to gain a good understanding of the issue. So, let’s discuss some of the common complaints that Firefox users have reported.  Mozilla Firefox not Responding Firefox won’t open – In most cases, this problem happens when there is something wrong with the user’s Firefox profile. This issue can be fixed by recreating the profile. High CPU usage causes problems on Firefox – You might notice high CPU usage, whic...

  A  user agent  tells websites what type of browser and operating system you're using. This information helps the web server deliver content that's compatible with your browser. If websites tell you that your browser is outdated or incompatible even though Firefox is up to date, an incorrect user agent may be the cause. This article explains how to fix problems with your Firefox user agent so that websites work properly.  Fix Firefox Error User agent issues You can change Firefox's user agent to trick websites into thinking that you're using a different browser or operating system. Web developers might do this to see how their websites will appear on different systems and browsers. Sometimes, add-ons and other installations can change your user agent without your knowledge. Websites may not display correctly or may show a message that your browser is outdated or incompatible, based on the detected user agent. It's important to switch Firefox back to the  defaul...