Hi, I have created my own Mozilla Addon and I wanted to upload it on the Mozilla Addon platform but it’s giving error * manifest.json was not found and Your JSON is not valid. How can I fix it?
Make sure you correctly package your extension:
I have created borderify.js and manifest.json files, but I don’t know why it’s not working.
Does it work when loaded as a temporary extension through the about:debugging page? That may or may not provide better error messages: https://developer.mozilla.org/docs/Tools/about:debugging#Loading_a_temporary_extension
Please don’t submit borderify to AMO! 
We don’t like having test extensions listed on the site (see our Add-on Policies).
Are you trying to run your extension in a private window? If so, try running it on a non-private window.