Removing double click event! Rated 5 out of 5 stars
Ahaa. Very simple to edit out the double click event listener in the flagtab.xul document. I don't know how to make it an optional or I would post it here for anyone else who needs it that way. but if you open that document in notepad and delete the line that starts with
gBrowser.tabContainer.addEventListener("dblclick", and delete the WHOLE Line. Everything wil work ok but you won't get anything happen when you double click a tab.