Better handle vertical displays
The width of the Tor browser window is capped at 1000 pixels, but the height can grow without bound. We also always return "portrait" for our screen orientation, as per #13025 (moved). We should decide a sane way to handle this.
In https://trac.torproject.org/projects/tor/ticket/13025#comment:17, gunes gave us some data on what the distribution looks like in the wild. We should use that data to find the best way to cap vertical resolution, and what to do with the orientation bit.
I am thinking the best answer is to cap the vertical resolution so that people with vertical displays don't actually appear to be in that orientation due to a huge vertical size, and continue to lie about orientation, but I am open to suggestions.