I found [https://privacytools.io/browsers/#about_config a nice site] that suggested some advanced preferences tweaks for privacy reason. I followed along with it, but now Firefox will not remember the zoom level of any webpage. If I continue browsing a page in a single tab it'll continue at that zoom level, but if I open something in a new tab, it opens with the default zoom. Not only that, but it won't go to fullscreen on startup. It'll instead start up almost snapped to the left of the monitor it's on. I don't have a clue what setting could have done this. I thought it ''might'' be browser.sessionstore.privacy_level, but reverting that didn't have any results.