Rebase Tor Browser patches for FF61

In #25543 (moved), the tor-browser patches were rebased from 52ESR onto 60ESR. Here we need the tor-browser patches rebased onto FF61 because that is what the TBA patches are based on.

This should be significantly easier than #25543 (moved).

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information