I generally have a “home” Firefox window with my most used tabs pinned. Sometimes I close it before another window, so I was frustrated to “lose” it and having to redo my pins. But recently I discovered this feature. Joy!
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It’s going to be hard to diagnose, ultimately (e.g. what system are you running it on? What version of Firefox is it?). But the short answer is: it’s always possible something is compromised. You could uninstall it completely and reinstall fresh from Mozilla (again), in which case you should see identical behavior to what myself and others have mentioned.
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