firefox never stops "transferring data from"
terms people use: keeps spinning, the throbber never stops, page doesn't quit loading and Firefox's never-stop-throbbing behavior.
bottom says "transferring data from i.media-imdb.com"
this will prevent greasemonkey scripts from running.
it is also very annoying.
other people reporting this issue on imdb.com:
It seems to be a Firefox bug that the developers refuse to fix