Firefox>tools>add-ons>get add-ons> search for no script.
Click install. Each website has to be whitelisted. Takes about a day to get the hang of it.
Open the Firefox browser.
Click “Tools” on the top navigation bar, then click “Disable Script Debugger.”
Click “Yes,” then click “OK.” The script debugger is disabled in Firefox.
Read more : http://www.ehow.com/how_10062462_turn-off-debugging-firefox.html
You already got the answer for Firefox in another post. In IE, Click on Tools/Internet Options. Look through all of the Tabs to uncheck Script Debugging.
Don’t use Explorer
Set javascript errors to be ignored.
BFLR !