How to restore a most visited page

When doing a search, all of a sudden my most visited page or tab disappeared, how can I restore this?

Your list of details of the system does not show a pref browser.newtab.url changed, so if you're talking about the subject: newtab page and check if you see an icon of grid in the top right corner to allow the new tab page.

If you mean that the element most visited on the bookmarks toolbar then put back the pref browser.places.smartBookmarksVersion via the context menu to 0 and close and restart Firefox.

Note that your list of details of the system shows that you have a user.js file in the profile folder to initialize prefs each time you start Firefox.

The user.js file is present than if you or another software has created this file and normally it wouldn't be here.
You can check its contents with a text editor (right click: open with) If you do not create this file yourself.

The user.js file is read whenever Firefox is started and initializes the preferences to the specified value in this file, so the preferences set via user.js can be changed temporarily for the current session.

You can use this button to go to the Firefox profile folder currently in use:

Tags: Firefox

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