If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems. You can try to create a new profile to test if your current profile is causing the problem. Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access for Firefox and the plugin-container process and the updater process. It is possible that your firewall or other security software blocks or restricts Firefox without informing you, possibly after detecting changes (update) to the Firefox application. ''If your question is resolved by this or another answer, please help other users by marking the best reply as Solved. Hi, hold down the Shift key when you start Firefox to start in Safe Mode. If your question is resolved by this or another answer, please help other users by marking the best reply as Solved. You can now double click the file you previously downloaded to install Firefox. Now delete the Firefox installation folder which should be in one of the following locations. With Firefox closed, use another browser to download Firefox from and save the file to somewhere convenient on your computer. Downgrade Firefox if you encounter the issue after update. When the update finishes, restart Firefox and open YouTube videos. The About Mozilla Firefox window opens and it will check for the latest version and download it automatically. This process does not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location. Open the menu on the top right corner, select Help > About Firefox. If that doesn't work, try a Clean Reinstall this means you remove your Firefox program files and then reinstall Firefox. You may need to restart Firefox after enabling some extensions. If it works in Safe Mode, disable any theme and extensions - 3-bar menu > Add-ons > Themes/Extensions and restart Firefox if it's OK, re-enable them one by one until you find the culprit. More - Diagnose Firefox issues using Troubleshoot Mode.
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