User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0 I have set: Tools > Options... > Advanced > Tabbed Browsing > Open links from other applications in: a new window Now when I click on a link in Thuderbird, for example, and Firefox is already running, the existing Firefox window will be focussed for a fraction of a second before the new window is opened. This itself would not be an issue, but when I then do a Ctrl-Tab to switch back, the first Firefox window appears in place of the expected Thunderbird window. You can of course press Ctrl-Tab-Tab, but I would consider this a bit of a usability issue neverthless. Reproducible: Always

*** This bug has been marked as a duplicate of 255123 ***