Found out that gnome 3 has some keybinding for dynamically changing screen resolution. I don't know which keybinding that is, but I found it during the mash the keyboard test.
... or at least I thought it returned to normal...
Having read your comment, I realize all the text on my display is subtlely squashed and blurry in a way that I didn't notice, but is pretty obvious now that I'm looking for it! ><
I tend to have about 250-300 tabs open in total. Various things I mean to get back to, reference material for projects that I've paused working on, etc.
In general when it costs you nothing to keep a photocopy of a reference on your desk, the desktop becomes nothing but photocopies of reference materials.
I'm back up to 89 tabs now, after having recently cleaned it up a bit.