When I switched to FF4, I set up the option to auto-hide my bookmarks tab on Firefox after 2 or 3 seconds when mouse isn't on it anymore. It was quite useful for its time, even if it bothered me that whenever it scrolled back up, whatever website I had open also moved a little and I'd miss whatever I was clicking at the moment. Now my browsing preferences have changed and I don't use the tab anymore, so I deleted all the bookmarks from the tab and tried to disable the whole tab from Firefox menu options. But whatever set-up I did overrides it and makes the bookmark tab appear for 2-3 seconds anyway. I know it's not an add-on, seeing as I have very few add-ons installed and I could not find anything related to this on my add-on manager. I also don't remember editing a script to do this. I've tried installing different auto-hide add-ons, hoping they'd override it somehow, but it won't work. I also tried installing a Stylish style to do the same thing and then put the settings at 0 seconds and 0 opacity in case it would override it and thus (in a way) disable it, but even with these settings I see the bar appearing for 2-3 seconds just like before, although much slimmer than before. It's a small detail, but after hours of trying to get rid of it, it starts to get very annoying.

I believe I originally found the instructions on how to able the auto-hide on Lifehacker, but now I can't find out what exactly I did and how to undo it. Does anyone know what I have installed, why it isn't showing on the add-on list and how to disable it? Thank you very much, I simply can't stand this frustration.