While I would agree that these changes are unfortunate for this specific use case, I do believe there are at least two workarounds for you:<p>1) Creating an AMO account and running the command line &quot;jpm sign&quot; tool yourself.  This requires a bit of overhead per each new addon you want to make modifications to, but the actual signing of unlisted addons (which is entirely automated) had been fast and mostly painless in my experience.<p>2) Using Firefox Aurora&#x2F;Developer Edition as your main browser and relying on its automatic update mechanism.