I was looking through the Thunderbird builds board on mozillaZine when I came across a thread asking about having toolbar (icons) next to the tabs in Thunderbird like you could in Firefox. I didn’t quite understand this thread the first couple times I read it. The poster did a mock-up ‘screenshot’ of how this would look in Thunderbird. This got me wondering, ‘which version of Firefox allowed you to have toolbar icons next to the tabs’?
I tried it out on Firefox 5 Beta and sure enough it is possible as seen above. I moved the Greasemonkey icon onto the tab bar. Okay, so may be this was new feature I was not aware of with Firefox 5. But, I gave it a try in Firefox 4.0.1, and discovered it can be done there as well. Now this got me wondering if this was part of the original 4.0 release. So, I downloaded and installed Firefox 4.0.0 (I now have around 10 different version of Firefox on this computer, thank goodness for ProfileManager) and sure enough it can be done there as well.
Simply right-click on an empty area in the toolbars or on an existing icon and select Customize.. Find the icon you want to move and drag it to either the left or right of your tabs. Once you are done click the ‘Done’ button to save your changes. This appears to work in Firefox 6 as well as 7 (which has made a slight UI change that I will address in a future post).