I recently bought a new 4K Samsung TV (basic 42" model) and I hooked it up to my old computer (for reasons, mostly watching various video files, films, etc).
When I call up Firefox, it comes up much larger than the screen no matter what I do. I can't even grab the corners to pull it in, and F11 just toggles between being somewhat too large and far too large. Control plus and minus make the middle parts shrink and expand but do not change the frame itself of the browser.
Any suggestions on how I can get a handle (not a pun) on this?