Torbutton's readme still talks about toggling
https://gitweb.torproject.org/torbutton.git/tree/README has the very first FAQ entry of "I can't click on links or hit reload after I toggle Tor! Why?"
and at the very end it says
There is currently one known unfixed security issue with Torbutton: it is
possible to unmask the javascript hooks that wrap the Date object to
conceal your timezone in Firefox 2, and the timezone masking code does not
work at all on Firefox 3.
and I bet a lot of the stuff in the middle is obsolete now too.