Commenting a Firefox extension

I'm looking for someone to add comments in the Feedly extension [login to view URL] It is used to help users access its site. Each functional line of the code needs to be commented, indicating its purpose, function and, if the site design requires it, then why. Comments can be short as long as they are clear. You must understand why their site requires the user to install this extension in order to access it. PM me some works you've done in the past that has clear comments. Budget is under $50.