Urls we can mod, and often do. Images though, are equally as annoying to us as you I'm afraid. I'll draw Charley's attention to it and see if we can come up with a sensible means of getting folks into the habit of posting smaller images.
I find that if the browser is full screen and also the favourites (addresses) are unchecked I get a full screen.
Example this morning is the thread put up by Lynx, this needed the scrollbar unless you are viewing using the technique I mention above.