User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.0.1) Gecko/2008070208 Firefox/3.0.1 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.0.1) Gecko/2008070208 Firefox/3.0.1 i was always loved firefox, because of the speed, but this last release is causing lof of trouble at daily basis because if i'm on one page then i close the firefox, cause i not need that page any longer, then if i want to go to some other web places then firefox reporting me that the browser is already running and it is not possible to run another instances i will be very honest, this is the FIRST and ONLY product i ever encountered such an annoying, anti-user behavor and it is very sad also, because the previous version never done such an extreme thing to me, EVER!!! Reproducible: Always Steps to Reproduce: 1.open/run firefox 2.brows a little bit, then close firefox 3."quicly" open/run firefox Actual Results: i see a warning message what is explaining that firefox is already running and it is not possibe to run it again Expected Results: the software sould open fastly the browser with a web-page

It takes a while for Firefox to stop, slightly more than a second for me, depending on how long I have been surfing. The reason is that Firefox is closing several databases, cleaning out old data, saving the current bookmarks, cookies, garbage collecting, saving the current tabs (optionally), etc ... So it's possible that the application is still running even though you don't see a window. When you start up again very fast, it might be that the new copy won't start because the old is still running.