in Firefox I have to click save, click the "X" by the address bar to stop the process,
This could be a javscript issue, that is a script which is caught in a loop -- in these cases, eventually firefox will interrupt and ask if you want to keep the script going.
If this is the case, you should disable all non-core plugins and if the problem stops, re-enable them until you find the culprit.
Edit:
Newer version of what, by the way? I skimmed over that earlier. Maybe that's the problem.