On the Chrome extension, the top HN comment was pointing out that it doesn't show change in owners, but change in the owner's key, which makes it susceptible to false positives and false negatives. Does the Firefox version work any more reliably?
Honestly, I'm not sure what difference this makes. If someone really wants to hide their sale of an extension, they can absolutely include the usage of their dev account to the buyer, rather than making use of mozilla's system for transferring ownership.
If you're curious, here's the relevant section of code. I'm totally open to reworking it if you have alternative suggestions:
https://github.com/maxtheaxe/under-new-management-firefox/bl...
I'm hitting the AMO API directly, so you can see an example response of all the data I'm working with here:
https://addons.mozilla.org/api/v5/addons/addon/under-new-man...