[Plugin: Contact Form 7] Break on error

This is a problem with Firebug, not CF7. Firebug JS debug does not properly interpret try/catch loops and incorrectly assumes the program is broken. @wjm’s solution “buries” the issue with firebug but will remove some functionality from CF7. The best way around this is to disable firebug’s JS checker when developing, and ignore this case until the next version comes out that interprets try/catch loops properly.