Turn Off Unresponsive Script in Firefox (tweak)
Another great old tweak from lifehacker.
I can’t really remember when I’ve started to encounter this problem, but I have a hint that it started when I updated my version of Firefox to 1.5.x (just like in my reference site).
It looks like this :
(click image to enlarge it)
Quick Fix:
Type about:config in Firefox’s address bar.
Copy/paste dom.max_script_run_time in your Filter textbox field..
Change the value to something higher than the default (which is 5.).
Change the default setting to something higher. Mine’s set to to 20 (like on the site).
Complete tweak here.