User-Agent: Mozilla/5.0 (X11; U; Linux i686; cs; rv:1.9) Gecko/2008051202 Firefox/3.0 Build Identifier: Mozilla/5.0 (X11; U; Linux i686; cs; rv:1.9) Gecko/2008051202 Firefox/3.0 On first run or after version switch or after some period during firefox startup it checked for new extensions and pop up empty proxy login window for each extension even I previously fill the proxy credentials and checked the box to remember it. Reproducible: Always Steps to Reproduce: 1. everytime on first run 2. everytime when you switch versions of firefox 3. sometimes after expired time for extensions new version check Actual Results: Pop-up many empty proxy login windows. Expected Results: 1) It would be nice if it pops up only one window 2) Even nicer if it takes saved proxy credentials 3) and the best if it does not pop up anything unles proxy credentials are invalid and proxy denied it.

This will be essentially the same issue as bug 356930

Should have been fixed by bug 339804