After I press the back button to go to the previous page, the scroll bar thumb no longer moves when I scroll on that page. Firefox still remembers the position of the webpage as I left it and I am still able to scroll with the keyboard/mouse/scroll bar buttons, and can even drag the thumb itself - the only problem is that the scroll bar thumb doesn't move anymore to indicate a changed position on that page, not even in response to dragging. This applies to any page accessed using the back button. The scroll bar thumb only works correctly when I am on the latest page (the most recently accessed page). Basically, if I access a webpage and then click a link to go on to a different page, and then press the back button to go back to the previous page, the scroll bar thumb is just frozen on the scroll bar when I scroll on said previous page. I've tested this on multiple websites and have gotten the same problem for all of them. Refreshing on the page fixes the problem, but I really don't want to have to refresh every time I uses the back button. This only happened after I updated to the latest version of Firefox. I have tried reinstalling Firefox and running Firefox in safe mode, but the problem persisted. But it doesn't seem to be a bug since my sister runs the same version and doesn't have this problem... is there anything I can do to fix this?