New issue by espectalll on void-packages repository

https://github.com/void-linux/void-packages/issues/11493
Description: [According to Mozilla](https://bugzilla.mozilla.org/show_bug.cgi?id=1422689), Firefox uses `toolkit.telemetry.enabled` to collect "somewhat more information" about a web browser's activity and report it back to Mozilla. It should only be enabled on beta, aurora, and nightly builds, and it's always a locked setting. However, on the stable builds delivered by Void, `toolkit.telemetry.enabled` is set to `true`.

Take into account that data reporting is (theoretically?) disabled because of the build settings, and so Firefox tells the user in `about:preferences`.