Rated 1 out of 5 stars

Not Free, can't check backlink free, too bad, bad, very bad.....very low review......

This review is for a previous version of the add-on (1.0.1-signed). 

It is free to get link count data

The link count data does not require an account with Majestic, but certainly, this tool is much more effective if you have a Majestic account.