This is very useful, but... Rated 3 out of 5 stars
It would be ideal if I could set the browser to a specific setting for all sites, like "Desktop Firefox", but set certain sites--Facebook for instance--to use a particular setting, like "Default" or "Android (Tablet)". It's a nuisance having to adjust the setting all the time manually depending on the site I'm visiting.
I'm using the Firefox Nightly Build--Always updated to the current day. The current release, Beta, and Aurora all turned out to be crap on the TF201. But Nightly turned out to work wonderfully and with unexpected stability for an Alpha release. Phony works great on Nightly, it just seems like an obvious functionality is missing, as described above.