Everything works as expected, I have no issues with it. But this extension appears to be a little bit over the top with energy usage. Every time I load a page (or switch tab!), this extension energy usage (measured by about:performance, this probably reflects used cpu cycles) goes way too high, it's energy usage is sometimes as much as two times higher than whole firefox, with all tabs and extensions, cumulative. Turning off auto filling login forms didn't help.

Otherwise it's great extension, and I can recommend it. I had no issues with it nor with desktop or mobile apps.