It's very great, but I just wish it could close all the discarded tabs automatically (if possible)

rất tuyệt với!

Might have left Firefox without this.

It doesn't work anymore.

excellent context menu integration

simple and easy to use

Not sure whether it is working or not.
Even after discarding most of the open tabs
(~150 ), I couldn't see any noticeable memory usage reduction....
Could someone give some numbers (bytes or percentage)
of memory amount recovered after discard of a (big enough,
for to be trustworthy) number of tabs?

There is no other way for me to open 20 youtube tabs without lagging.

Simple and works well, loaded with settings/preferences so you can really fine-tune it's behavior the way you want it. Awesome!