If you can't inspect the certificate via "I Understand the Risks" then try this: It is up to you to decide whether you accept this intrusion and trust this software as it can see everything you send over a secure connection. act as a man-in-the-middle- MITM).įirefox have nothing to with such an intrusion and can't do anything apart from warning you. To be able to monitor a secure connection they have to build a two way connection between themselves and Firefox and between themselves and the internet server (i.e. On Windows there is a lot of (security) software that decides to intercept and monitor all internet traffic and in order to do that they place themselves in the connection. ![]() For more information, see Troubleshoot Firefox issues caused by malware.Did you check the issuer of the certificate(s)? Periodically, you should scan your system for viruses, spyware, or other malware. Malware (short for “malicious software”) can cause problems with Firefox. See Configure firewalls so that Firefox can access the Internet. 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. Some Internet security software (including antivirus, antispyware, and firewall programs) can cause problems with Firefox, including blocking it from opening websites, crashes, and more. To reinstall these components, download and run the latest installer for Visual Studio from Microsoft Visual C++ Redistributable latest supported downloads and then reboot the computer.Ĭheck for conflicts with your Internet security software This can happen after installing or uninstalling other software on your computer. Some issues are caused by a corrupt or incomplete Visual C++ installation that is missing runtime components (Redistributable Packages) required by Firefox, especially VCRUNTIME140_1.dll. (For a list of all about: pages, enter about:about in the address bar.)Ĭheck for issues caused by corrupt or incomplete Visual C++ installation The Troubleshooting Information page ( about:support page) includes other about: page links and troubleshooting resources. Telemetry Data shared with Mozilla ( about:telemetry page) contains detailed data about performance, hardware, usage, and customization. The Firefox Task Manager ( about:performance about:processes page) lets you see whether tabs or extensions are slowing down Firefox. If you've tried all of these troubleshooting methods, and you're still having problems, here are some other solutions you can try: See the Profile Manager - Create, remove or switch Firefox profiles article for instructions. You can create a new, additional profile which will not contain any of your old Firefox data. ![]() 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 also do a manual refresh by creating a new profile and transferring your important data to the new profile. Note: There's a Refresh Firefox button in the Firefox Troubleshoot Mode window, if you can't start Firefox normally. To start Firefox in Troubleshoot Mode:Ĭlick the menu button, click Help, select Troubleshoot Mode… and click Restart in the Restart Firefox in Troubleshoot Mode? dialog. Under Try clearing the startup cache, click Clear startup cache… and then click Restart.įirefox 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).The Troubleshooting Information page will open. Click the menu button, click Help and select More Troubleshooting Information.This will not change your profile data or add-ons. Clearing the startup cache and then restarting Firefox can resolve various issues with the Firefox user interface (UI). Make sure other items you want to keep are not selected.įirefox also has a startup cache that stores certain temporary data, to improve startup speed. Below the drop-down menu, select both Cookies and Cache. ![]()
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