Handy, unobtrusive, yet incomplete Rated 2 out of 5 stars

I guess this could be handy, but why not have listing of what Linux distros have what kernel versions, as well? Why does it only give Windows info (and only small table, at that), nothing about Mac/Ubuntu?

This review is for a previous version of the add-on (1.1.rev67.1-signed). 

What Other Information

I really only designed this for the Windows operating system because the builds of the Windows OS go by a NT number when you view a user agent.
These NT numbers are not used often because the operating system is most commonly known by its market name (ie. Windows XP).
The Mac and Linux operating systems go by their version numbers. A chart for these to operating systems is really not needed.
Is there any information that I should include for the Windows chart information?