The browserid-bridge-gmail/config/production.json contained:
"personaUrl": "https://login.anosrep.org/",
That apparently prevented FF21 from working due to Content-Security-Policy. (It worked with Chrome and Safari; don't know which implementation is "wrong").
Anyways, change the build system to produce production.json with no trailing slash:
The browserid-bridge-gmail/config/production.json contained:
That apparently prevented FF21 from working due to Content-Security-Policy. (It worked with Chrome and Safari; don't know which implementation is "wrong").
Anyways, change the build system to produce production.json with no trailing slash: