Not trying to pass this off as my own, so I'm sad to see your 1 star review. I clearly state this is a fork of To Google Translate, made before the add-on was changed to require more permissions. If you didn't know, yes a fork is a "copy" of software, free licensing allows for this. Forking is an integral part of the free software community. You can read this in the description by the way:

Software Information

This is a fork of the 3.9 version of To Google Translate by Juan Escobar, before the changes in permission requirements were made to requires sharing all your website data. I'm not comfortable sharing all my data, maybe you are not as well, so that's why this is here