Do not recommend addons on Tor Browser

Apparently Firefox recommends a set of extensions, and so Tor Browser Android recommends them too.

Here's the screenshot from a nice person on #tor:

So it sure looks like Tor Browser Android is recommending some extensions to users.

Noticed because we had a person on irc who wanted to learn more about privacy badger, and was convinced that we recommended it because (quite reasonably) our software says that we do.