User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.2) Gecko/20060308 Firefox/1.5.0.2 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.2) Gecko/20060308 Firefox/1.5.0.2 We have two input fields (others might just work too), input1 has event handler for blur attached to it. When blur event is triggered it gives focus to input2. If blur for input1 is invoked by switching away from Firefox i.e. clicking the taskbar, things mess up. Address/search bar becomes unusable (seems they refuse .focus event) just like input1 and input2 fields. I'd rate this critical, Firefox kinda hangs. Reproducible: Always Steps to Reproduce: 1.Open testace 2.Click the taskbar 3.Go back to Firefox 4.Try to type into the address bar or searchbar or type something into input1 Refreshing the page does not help unless before refreshing sourcecode is modified then everything goes back to normal. Applies to "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20060418 Firefox/2.0a1" too

confirmed as described with test case.. URL bar becomes unusable, shortcuts to switch between tabs no longer work

Confirmed with 2006-04-20 trunk build.

One of our customers also reported this bug to us. Basically we validate forms during the onBlur event and if customers switched windows and then switched back to Firefox, all keyboard focuses were broken. This testcase is an example of validating a form. FYI, The setTimeout is to work around bug 53579.

Can you reproduce with Firefox v2.0.0.14 ? (or Firefox v3.0pre ?)

The testcases still work in 3.0.7. After running one of the two testcases I can't use any <input type="text" /> and <textarea> (including the urlbar and searchbar) anymore.

works here