I have several tabs. Last I closed a bunch I was over 200, so it's a bit annoying when I start Firefox to do something, and randomly it'll start up the tab(s) of Facebook I have among the many. It doesn't matter what tab I was on when I exited Firefox last, Facebook will be loaded without fail. I tried it several times with different sites, and I never exited with Firefox being the page I was on last. Often my tab list on the top will be scrolled over (not by me, it happens when the Facebook tab loads) and I will have to scroll back to find the currently open page's tab. (The loaded page, whatever I was on last is on the screen, no problem with that.) Anyway, I could list several reasons why this is a nuisance, but the thing is: I do not know why this is happening, it is disruptive, so I wish to understand the problem and stop it from happening. This has persisted throughout several versions of Firefox, so I do not think it has to do with updates, but I do have the Facebook Container and F.B Purity addons.