Something I've observed since at least today is that if I have more than one pinned tab, and I close Firefox then start it again (it is set to open my default homepage), my 'focused' tab by default is the right-most pinned tab. If I have one pinned tab, the homepage is focused as it should be. I have tried starting Firefox with a -safe-mode and gotten the same result, however starting a new profile didn't seem to carry over the problem, therefore my problem is restricted to this profile (but at the same time, has nothing to do with my extensions). I do not recall making any changes to the browser by myself (I'm careful about it, so I'm pretty sure about that regard). Whatever the problem is, it has crept in from somewhere else. I tried resetting what few changed about:config entries I have, but have had no solution, and it's a minor annoyance, but it's driving me up the wall because if I have a homepage, I expect it to be open when I start the browser!