User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0 Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0 Firefox 4 RC 1 - Windows 7 64 bit Pentadactyl 1.0b6 This does not happen without Pentadactyl and I'm not sure if it's a bug within that plugin or a bug with firefox but I'm going to post it anyway. Here are images of the bug http://imgur.com/a/XjEUS (In reverse order) Reproducible: Always Steps to Reproduce: 1. Right click the tab bar and select "Menu Bar" 2. Right click the tab bar again and unselect "Menu Bar" Actual Results: http://i.imgur.com/3EAKz.png Expected Results: http://i.imgur.com/hGiA3.png
Confirmed on Windows XP:32 bit with 4rc. This issue would be noticed from the time "Tabs in Title" is introduced in the browser
Confirmed on Build identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0b13pre) Gecko/20110314 Firefox/4.0b13pre. But i think this is an Extension Compatibility issue.
Legacy extensions are no longer valid in Firefox 57, closing.