User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.1) Gecko/2008070208 Firefox/3.0.1 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.1) Gecko/2008070208 Firefox/3.0.1 If you have a proxy and it asks for your password - Firefox shows a dialog to enter it. Normally you enter it only once. But if you have a number of tabs saved from the previous session, Firefox will show a number of such windows to enter your password. Reproducible: Always Steps to Reproduce: 1. use a proxy with authorization 2. open a number of internet web sites 3. select 'When Firefox starts' option to 'Show my windows and tabs from last time' 4. restart Firefox Actual Results: a number of 'enter password' windows are opened Expected Results: only one 'enter password' window