Back in , I believe, Foxfire 3.0 when you return to a page instead of returning to the spot you left it always returned to the top of the page.

Yes, it is a regression. Here's a recent discussion: [https://support.mozilla.org/en-US/questions/955144 Firefox 19.0.2 doesn't remember my place when I use the back button. It always goes to the top of the page ~ why?] And here's the bug: [https://bugzilla.mozilla.org/show_bug.cgi?id=851445 851445 – Back button does not restore scroll position on a specific site (Allegro.pl)] (no need to comment at this point as a fix seems to be in the works).