By simford on Jun 03, 2007
I'm using Ubuntu 7.04 as the desktop. The version of Firefox on Ubuntu is 184.108.40.206 (just updated to 220.127.116.11 yesterday). There is a handy feature introduced in Firefox 2.0.x series: 'Undo Close Tab'. At the beginning, this menu appears when right clicking on the Tab. But it will disappear later.
I thought it was because I installed GreaseMonkey extension. Yup, Grease Monkey is too powerful, and will bring un-expected effects sometimes. I tried to uninstall GreaseMonkey extenion, but I still can't find the 'Undo Close Tab' in the menu. I also created a brand-new profile (mv .mozilla .mozilla.bak, then launch Firefox). I can see 'Undo Close Tab' at first, then I lost it after restart Firefox several times.
When I searching through the settings on Preferences, I found a 'Startup' setting on 'Main' tab. The 3rd option for 'When Firefox starts:' is 'Show my windows and tabs from last time'. I happened to choose it, then 'Undo Close Tab' is back again. And it works pretty well until now.