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With TB 11.0 on both WinXP and Win Vista (lastest SPs), the add-on does not support the Show "icons and text" customization (meaning show text below the icon) on the tool bar - it instead puts the text beside the icons, causing some of my tool bar items to disappear off the edge of the screen. With some tweaking, this will be a great add-on to combat the annoying loss of choice as to where the tool-bar goes in TB 11.

Это отзыв для предыдущей версии этого дополнения (1.0.0.0). 

I can reproduce the issue. I already located it, but don't have time to fix it in the next days.
Also, I won't update until the review is done by AMO, as it would not become public for another 10 days then.

Edit: try the new version (not reviewed yet):
https://addons.mozilla.org/thunderbird/addon/rise-of-the-tools/versions/1.0.1.0