Someone submitted a PR to Mozilla to fix this, and the Mozilla devs closed it, arguing that Google Analytics does not count as tracking. See: https://github.com/mozilla/addons-frontend/pull/2787#issueco...

The TOR devs are fixing this part in their browser, and their comment was:

> Disallow `about:addons` unless the extensions directory is volatile, because regardless of what Mozilla PR says about respecting privacy, loading Google Analytics in a page that gets loaded as an IFRAME as part of an `about:` internal page, is anything but.