I used to have an extension that allowed me to put tool bar icons pretty much any place I wished.
Specifically I placed an "undo closed tab" icon (supplied by another extension) at the far right end of the tabbar.
I lost track of it some time ago, and haven't been able to find it.
There are a few extensions that offer similar functionality, but I have been unable to place the "undo close tab" icon on the tabbar.
Any help would be great, I use Mozilla Firefox 2 (FR), English-only extensions are fine.
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Aside from this, I am offering this space for anyone to recommend useful extensions to me or anyone else.
If there are a few posts in this direction then I will come back with my own favourite extensions.