Works great! But... Rated 5 out of 5 stars

...but for the love of all that is good and delicious, is there any chance you could update the full version of BarTab (even through forking), so that we can get the most desired auto-unload tab feature?

While the original addon does seem to work, unfortunately, it has some bugs, such as when a tab gets unloaded, if you click back to it, it doesn't reload the tab -- it just shows a blank page.

There is also an issue with disk thrashing :/

This review is for a previous version of the add-on (1.5.1-signed). 

Check out the philikon/BarTab network on GitHub

First of all, thanks the five star review!

I'd like to keep this addon lightweight, but I will see what could I do for You.

Anyway You could give a try to inverseparadox' work, see:
https://github.com/inverseparadox/BarTab