Every time I start Firefox the 3rd party home page I have set in Options or dragged its tab to the home icon is replaced by Yahoo's home page.
I have repeatedly set my home page as a 3rd party site (Xfinity.com) by setting it in options and by dragging its tab to the home icon. However, every time I start Firefox the home page has been changed to Yahoo. Nothing I do makes my home page stick. Every Firefox start shows Yahoo as the home page.
Alla svar (1)
Your System Details list shows that you have a user.js file in the profile folder to initialize prefs each time Firefox starts.
The user.js file is only present if you or other software has created this file and normally it wouldn't be there. You can check its content with a plain text editor (right-click: Open with) if you didn't create this file yourself.
The user.js file is read each time Firefox is started and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.
You can delete possible user.js and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release.
- http://kb.mozillazine.org/Preferences_not_saved
- https://support.mozilla.org/kb/Preferences+are+not+saved
You can use this button to go to the currently used Firefox profile folder:
- Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)