From there, you can pick your default browser, call redirecting, caller ID, digital assistant, home launcher, phone, and SMS default applications. Just go into your Settings app, select Apps & notifications, click on Advanced, and then go into Default apps. A new popup will appear asking to confirm. Then click the Menu icon which is located on the right side of the toolbar. Linux: Run /path/to/firefox/firefox -safe-mode from Terminal.Mac: Hold down ? Option while opening Firefox.
If this doesn’t work, search your computer for a "Mozilla Firefox (Safe Mode)" shortcut.
Windows: Hold down ? Shift while opening Firefox. How do I reset Firefox without opening it?Ģ Method 2 of 3: Resetting Firefox When It Won’t Open (This will not remove your passwords, bookmarks or other user data and settings which are stored in a separate profiles folder.) Uninstall Firefox. The solution is to remove the Firefox program and then reinstall Firefox. This error is caused by a problem with Firefox program files. Mozilla will then warn you that you’re about to remove browser add-ons and restore everything to its default configuration. Click Refresh Firefox at the top right corner on the Troubleshooting Information page. Choose Troubleshooting Information from the Help menu. How do I set Firefox to default settings?Ĭlick Help near the bottom of the screen. Restart Firefox ( new versions of these files will be created automatically). 
Open the profile folder – refer to this FAQ.Restore Default Values For "about:config" Entries in Firefox Sometimes problems can be fixed by simply restarting your computer and then starting Firefox again.
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