I just updated one of my companies Firefox Add-on’s to support being signed; however, I have noticed that running ‘jpm test’ no longer runs locally. I even downloaded the FirefoxDeveloperEdition and pointed jpm at the binary and the tests still do not run. Running ‘jpm test’ just opens firefox to a blank page and sits there. 
Is anyone else having this issue?
jpm test -b /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/firefoxjpm test
This command runs an add-on’s unit tests. The command:
Looks for a directory called “test” within the current directory (or --addon-dir).
Opens every file in there whose name starts with “test-”. Make
note of the hyphen after “test” in the filename. jpm test include a
file called “test-myCode.js”, but will exclude files called
"test_myCode.js" or “testMyCode.js”).
Call every function exported from that file whose name starts
with “test”.
(https://developer.mozilla.org/en-US/Add-ons/SDK/Tools/jpm#jpm_test).