2015-05-26 ∞

2015-05-26 on Pale Moon 25.4.1 (x86) and a similar version on x86_64 Linux.

I approve.

I dipped into its earlier versions to find version 0.6.20140217 (2014-02-17), which works for Pale Moon.

I edited my chrome stuff to remove my own tab modifications. The red I placed on the current tab doesn't look good with this theme.

2010-01-31 or earlier ∞

Tested on Firefox from way back then.

Wow!
Not enough contrast between the black background and the lighter grey around the toolbar buttons (top picture).
I really like the look of the tabs. The shape and the colour of the background, selected and not selected tabs and the title text. Very well done.
There's a cute little space shuttle picture which ought to be hacked out of the Addons list.
The url text is very hard to read (no contrast) when loading a page.
- [edit: this was due to the Fission addon]