I work on a firefox addon using JPM.
I want to install it on my android phone, i\'ve run \"jpm xpi\" and copy xpi on my sdcard. When i browse to file://path/to/my/xpi in
This is a problem because of the different Versions. I had the same problem as you. I tried to install the xpi manually. The trick is to install versions that are older. So currently Firefox v43 does not work. But v38 or v39 for Example works without any problem.
v42 for Example does not work. v41 works. It seems like they changed something here. Because the Explorer also offers 3 Options to Start Firefox with v42, but only 2 with v41.