ABANDON-WARE (See Developer’s Comments below) Rated 3 out of 5 stars

I am disappointed. I've been telling everybody with FF to use THIS addon and 2 years after the last update I find out it's been abandoned.

Meanwhile it's no good on many sites like Airmiles: https://www.airmiles.ca/arrow/login/SignIn

Is there a supported clone of this addon?

This review is for a previous version of the add-on (1.0.3.1-signed).