Rated 5 out of 5 stars
What I was looking for... for years... :-)
Because unless you're a real tech pro and even so,
the "basic" Firefox "about:memory" is far too complex (at least for me)
and I could never figure out "which add-on is doing what"...
10 stars and...
10'000 lives, as were used Chinese to whish Long Live to their Emperor !
Will keep the xpi file aside, in case Mozilla would remove it,
as I see it is experimental.
As already been said, should be in Firefox natively installed !
So thanks a lot :-)