Csillagos értékelés: 4 / 5
Pale Moon 28.4.1 x64
As soon as the addon was updated to 2.9.9, the browser behaved like a crawl.
Slow. Sluggish. Choppy.
One core full load, so 25% CPU usage all the time.
As soon as I downgraded back to 2.9.8 - issue gone immediately.
And I use this source, because Pale Moon does not support WebExtensions:
See also here: