I checked all the scripts in the .xpi file locally on my device and confirmed for myself that the extension only reads local CSS and does not contain any outgoing tracking or telemetry code.
But since I’m already creeped out, I’ll turn off auto-updates and recommend others do the same :) I hope permission can be bypassed in the future.
Edit: Indeed, that'll definitely save some time XD

Beautiful

Molto utile e moderna. Sarebbe bello che firefox avesse un effetto glass come safari.

Oh my goodness, it’s so good! I wonder why I didn’t discover it sooner.

nice

I fucking loved it!