Return that addons is corrupted while downloading

I try to download my own extension for testing, but i receive this error message “Installation aborted because the add-on appears to be corrupt.”. I check all my files, but nothing are different than before when it’s running perfectly. I remove my addons and repost in the store, but the error come back. Someone could help me ?

I downloaded “midip-1.0.0.xpi” from and unzipped it.

When I loaded it as a temporary extension, Firefox showed an error message.

Error message text:

There was an error during the temporary add-on installation.
Error details
Extension is invalid
Reading manifest: Error processing developer: Unexpected property “websiteUrl”

Error message screenshot:


See manifest.json > developer for the correct key name.


Thanks, now it runs perfectly !