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We rather see a fatal failure here e.g. if the file we want to remove
has moved.

We have just create the ${browser_profile} dir, and we did not put any
of those files in there, so they cannot possibly exist.

It makes a bit of sense on its own, and it guarantees that no weird
cruft in ~/.tor-browser will interfere for whatever reason.

This way the chroot browsers will close faster.

We could use `cp --no-dereference` before, when the TBB_EXT dir only
contained symlinks. This will reduce the memory footprint of the
chroot browsers, and incidentally fixed a bug where the
unsafe-browser's name wasn't set since we copied the langpack before
we fix the name in it.

We don't have to fix the name in all branding files, only for the
locale we're actually gonna use.