Did Firefox uh... forget to add content script support?! 🤔😅
I tried porting two simple MV3 extensions to Firefox (following their migration guide
) and wasn't able to get any of the content scripts to work.
The only "trick" I could do to get them to be recognized was:
1. Change the manifest_version to 2 and load the extension like this.
2. Change the manifest_version back to 3.
3. Reload in-place in about:debugging.