Dom.max script run time
From MozillaZine Knowledge Base
Possible values and their effects
The value is a positive integer, determining the number of seconds of execution before warning. 0 and negative values are considered "forever." (Default value is 10; 5 in versions prior to nightly builds dated 2006-07-27) (bug 335058)
In builds prior to 2005-10-11, values less than 0 were assumed to be the default (then, 5). In builds prior to 2006-07-27 (e.g., Firefox 1.5), this preference affected scripts running in content and chrome; the limit on scripts running in chrome is now determined by dom.max_chrome_script_run_time.
If you’re encountering the “A script on this page is causing Mozilla to run slowly” dialog often and you’d like to disable it, setting this preference to 0 will allow the script to run for as long as it needs. A large number may be more appropriate, though, to avoid locking the entire UI forever as the script executes.
First checked in
Has an effect in