I work at a university and our campus IT team is stumped by this, so I'm really hoping someone can help. Since yesterday the zoom level for my office's online application website automatically zooms out to 50% in my Firefox browser — even though I have the default zoom level set at 100%. This is ONLY happening on this specific domain/site. On any other website the default 100% zoom level sticks. I've never changed the default to 50% at any time (nor would I, since I'm visually impaired). I have to press Ctrl-0 to reset it to 100% — and it will stay at 100%, but only if I don't open any other that site's links in a new tab and/or window. For example, if I open Page A in Tab/Window #1 and Page B in Tab/Window #2 and reset both to 100%, once I toggle between them they both revert to 50%. IT'S MADDENING! Unfortunately, due to the nature of my work in this site (which I use all day long) I need have multiple Firefox tabs/windows open. It's just not sustainable for me to have to click Ctrl-0 every few seconds (literally!) just to get work done. I've tried clearing my cache, opening in Troubleshooting Mode, and adding a couple of zoom-related extensions (Default Zoom and Fixed Zoom), but nothing's worked. Our IT guy also tried doing something with "resist.fingerprinting" (??) but that didn't do anything, either. Short of exporting all my bookmarks and un/reinstalling Firefox, I don't know what else to do. Any suggestions? p.s. Please note that I am not very tech-savvy, so responses in plain English are appreciated!