After experimenting with a handful of new addons for Firefox, I've managed to foul up some setting permanently.
Using certain sites--take Netflix for example--upon clicking into a details page for a movie, I'll notice a
#height1754
being added onto the end of the URL. When I use the back button, the only thing that happens is the removal of the above suffix, while remaining on the same damned page. A second click on the back button actually takes me back to the previous page.
I've heard of similar issues that were particular to IE, but haven't found anything involving all of them.
Any suggestions and/or explanations?