Also use TorBrowser's mozconfig

The Tails browser’s debian/rules sets MOZCONFIG to a Debian-specific one. Therefore, the .mozconfig installed by a TorBrowser patch is ignored. We should merge these somehow to be closer to TorBrowser.

See the mozconfig documentation.

Feature Branch: feature/6474-tor-browser-mozconfig

Related issues

Related to #6468 (closed)

Original created by @intrigeri on 6474 (Redmine)

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