Update about:tor when Tor Browser is updated
As part of #25694 (moved), I suggested having "Tor Browser has been updated" as a title in about:tor
when Tor Browser starts after an update.
The mockup is here https://trac.torproject.org/projects/tor/attachment/ticket/25694/1.3C.jpg
For users interested in view the changelog, we should discuss if an exclusive page for it is the best way to approach it.
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