Excellent add-on. Does exactly what is says and very very well.
It seriously can cut down on memory usage in seconds. Really helpful!
Props to the developer!

This should be stock.

Doesn't do anything. Garbage.

edit: Protip: use Tab Wrangler instead. That one does work and it's easy and intuitive.

+1

Well, I want to update translations this addon for my language, where I can do?
I can't find zh_CN in transifex's Join Team.
So I directly pull new request for this on github.

Some of my Bookmarks now have the discarded favicon permanently. I tried to remove, and re-add the Bookmarks, but it continues to display the faded favicons with the dot. That's annoying and needs to be fixed

It worked for a few hours, then it spontaneously wiped all its own settings and it now seems unable to save any new ones, so the addon no longer functions. The "Factory Reset" button doesn't work either (yes I'm dbl-clicking it).

Debugging notwithstanding, there's not much I can do but remove it.