I tried searching the forum in case someone else faced this problem before. I managed to find this:
https://support.mozilla.org/en-US/questions/1205572
Unfortunately, it has not solved my issue. My apologies if it is a replication.
I am trying to install an unsigned extension in firefox’s developer edition. I built the extension using web-ext, and dragged and dropped the XPI file to the browser. However, my extension is not being installed, despite using the developer’s edition.
I opened the command-line to check for any errors, and found the following:
Add-on brettel@example.com is not correctly signed.
Invalid XPI: signature is required but missing
I am aware that I can use web-ext run to get my extension running temporarily, but I would like to install the unsigned version if this is possible in any way.