Tree Style Tab – Decrease Tab Height

About a month ago a Tree Style Tab commit to raise the tab height for the “Metal” skin also affected the “Sidebar” skin.

If you’d like to revert these changes and decrease the tab height then do the following:
1) Download the latest treestyletab.xpi
2) Open the xpi file with 7-Zip (or a similar program)
3) Navigate to chrome -> treestyletab.jar -> skin -> classic -> treestyletab
4) Double click on the file “ui.css”
5) Remove line #233 which should only contain min-height: 22px; and save the file
6) At this point 7-Zip displays a pop-up:

File ‘ui.css’ was modified.
Do you want to update it in the archive?

Click “OK” and exit 7-Zip
7) Now there should be another pop-up:

File ‘treestyletab.jar’ was modified.
Do you want to update it in the archive?

Click “OK”
8) Drag the updated treestyletab.xpi into Firefox, update the add-on, and restart Firefox.

Enjoy!