User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0 Build ID: 20130326150557 Steps to reproduce: Nothing. FF20 installed today, and now I have this annoying error? Can I downgrade to FF19? Actual results: Anytime I load a new page in FF 20, I get multiple dialog boxes saying "Error: missing ( after for" Annoying. Expected results: Nothing
It's probably an issue with one of your extensions that's not compatible with FF20 anymore. Try in safe mode: https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode In addition, you should use the official support board for support requests, it's more appropriate than Bugzilla. Thank you. https://support.mozilla.org/en-US/questions
Okay, you were right. The offending Add-on was StockTwits 1.8.6. It's fixed.