JPM [error] No Firefox binary found at null

ubuntu 14.04 jpm出错:

$ jpm run
JPM [info] Starting jpm run on Demo Addon
Creating XPI
JPM [info] XPI created at /tmp/@demo-addon-0.0.1.xpi (16ms)
Created XPI at /tmp/@demo-addon-0.0.1.xpi
JPM [info] Creating a new profile
JPM [error] No Firefox binary found at null
JPM [error] Specify a Firefox binary to use with the `-b` flag.
JPM [error] Error: spawn ENOENT

解决:

jpm -b /usr/bin/firefox run