Firefox Unresponsive Script: Increase JavaScript Execution Waiting Time » My Digital Life

Finally, there's way to stop / postpone the annoying javascript execution warning.

1. Run Firefox.
2. In the Firefox address bar, type about:config, and then press Enter.
3. Scroll and locate or search with Filter text box for dom.max_script_run_time.
4. Double click on the line of dom.max_script_run_time, and change the value to a higher number (in seconds) that you want Firefox to wait before getting the Unresponsive Script warning. Be default, the value is 5 or 10 seconds. You can safely set the magical number to let’s say 20. You can set the value to 0 to instruct Firefox to wait foever - no warning and dialog whatsoever. Note that the whole Firefox may be not responsive and cannot be used while waiting for scripts to execute, so the number should not set too high in order to give you an opportunity to stop truly nasty or buggy scripts and recover use of Firefox.
5. Click OK.
6. Restart Firefox.

From: Firefox Unresponsive Script: Increase JavaScript Execution Waiting Time » My Digital Life