Battery-powered is never reliable though.

Jubilee is a part of the same pipeline. See this for example.

If telemetry is the problem, the rational thing to do is to use a fork/build of Firefox without the telemetry, not support the Google monopoly or go for browsers that have had potentially problematic privacy policies for a lot longer than Firefox.

Switching from Firefox to Chromium because of the latest Mozilla policy changes is insane. Google is ten times worse in every relevant aspect.