Mac: Delete Firefox from the Applications folder. Delete the Firefox installation folder, which is located in one of these locations, by default:.After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).Download the latest Desktop version of Firefox from and save the setup file to your computer.Note: You might want to print these steps or view them in another browser. This means you remove Firefox program files and then reinstall Firefox. *Click the "View." button and inspect the certificate and check who is the issuer of the certificate.Ĭertain Firefox problems can be solved by performing a Clean reinstall. *Click the link at the bottom of the error page: "I Understand the Risks" If "I Understand the Risks" is missing then this page may be opened in an (i)frame and in that case try the right-click context menu and use "This Frame: Open Frame in New Tab". You can see more Details like intermediate certificates that are used in the Details pane. Click the "View." button and inspect the certificate and check who is the issuer of the certificate.Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate". Click the link at the bottom of the error page: "I Understand the Risks".You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates. If you get an untrusted message then check out why the site is untrusted (click "Technical Details to expand that section) and if this is caused by a missing intermediate certificate then see if you can install this intermediate certificate from another source. Use a compressed image type like PNG or JPG to save the screenshot.ĭo you have a problem with a secure connection or blocked content indicated via an icon on the left hand side of the location bar? *''Once you get the pop-up, just select "'Start in Safe Mode"'' * Or open the Help menu and click on the '''Restart with Add-ons Disabled.''' menu item while Firefox is running. *You can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut. If it works in Safe Mode and in normal mode with all extensions (Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.Ĭlose and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit Mac: "Firefox > Quit Firefox" Linux: "Firefox/File > Quit") Once you get the pop-up, just select "'Start in Safe Mode".Or open the Help menu and click on the Restart with Add-ons Disabled.You can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
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