I'd been using Savard's Checker Plus for years with another browser. I'm glad to see it works just as well on Firefox. :)

Been using this on chrome and have contributed too, but for me the firefox version is pretty "laggy" as in the framerate is pretty low, compared to the chrome version. Is it supposed to happen? Other extensions run at a full 60 fps for me.

Edit: Fixed low framerate by downgrading to the previous version.

вроде работает .

This is good!

I love it but since the last update I can't use it anymore it sais: we have a special offer for bla bla bla and it doesn't show new emails

I extremely like this addon! Excellent!

Great add-on, BUT;
problems with dec 6th 2018 update.
Im Still getting alerts as normal- but when i click the little toolbar "envelope", just will not load.
White "window" appears with blue "loading/Reload" circle - but doesnt load. Waited 5 mins... and still window is white with blue loading circle just spinning and spinning.
Had to roll back to v21.2.3.....
..... Which is working fine.

Win 7 [64bit] - Firefox v56.0.2 [The Last version before Quantum]

Me ha encantado,le doy 5 estrellas

try to re-install... every time :(