Add a permanent way to opt out of Tor Browser advertising as a pref.
I want a pref that's the equivalent of doing something like:
pref("extensions.torbutton.donation_banner2017.shown_count", 50);
That will apply to all future donation banners. The only time I let Tor Browser actually write to the user profile directory at all is one launch per update, so the banner will get stuck on since the browser is incapable of writing back the counter.