Fennec needs "mouse mode" to be enabled to drag maps

[annapowellsmith]

Fennec (Firefox Mobile) needs "mouse mode" to be enabled before it can drag maps.

This is confusing for users who don't know about mouse mode, and annoying for those who do.

In fact, the desktop site works better in Fennec, because you don't have to move the map by dragging, you can put a marker anywhere that's visible.

What should we do about this? Options:

1. Auto-detect and redirect Fennec back to desktop site
2. Add a bunch of custom code for Fennec - could re-add our original draggable markers code, but it's extra code for everyone else to download, plus a maintenance overhead.
3. Just warn Fennec users about mouse mode with a toast message

I'm certainly leaning away from 2, given that Fennec is less than 1% of the mobile browser market: http://gs.statcounter.com/#mobile_browser-GB-monthly-201008-201108