User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.112 Safari/535.1 Steps to reproduce: Tools -> Clear Recent History (Select All Check Boxes). And click the submit button. Actual results: Whilst the clearing operation is in progress the browser freezes and changes to a 'Not Responding' state. Expected results: The clearing should happen and also the browser window should be maintained in a responsive state as other applications.
Bug 648232 was about a similar issue, but that issue might be resolved now considering bug 648232 comment 21. Are you able to reproduce your problem with the latest Nightly? https://nightly.mozilla.org/
Build identifier: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:9.0a1) Gecko/20110913 Firefox/9.0a1, build id: 20110913030846 Works fine for me on latest nightly. Reporter, are you still experiencing the problem? Are you able to reproduce it on latest nightly and/or in safe mode: http://support.mozilla.com/kb/Safe+Mode ? Thank you!