I have an extension on addons.mozilla.org using the old way of making extensions, and I am trying to learn web extensions. I went through the “your first” and “your second” tutorials on here (https://developer.mozilla.org/en-US/Add-ons/WebExtensions), and tried the borderify one and it works. I am trying to make a simple extension that just creates an alert, and I get this error:
There was an error during installation: Extension is invalid
That’s all I get. I have no idea where to start looking for the bug. I validated the manifest.json on jsonlint.com and it validated. The files are here:
Please help me understand what it doesn’t like. Thanks!