I tried to install Firefox 45 and there is not any link. It's really an error of the add-on.
I'm sorry. I only test the add-on on Firefox 46. The minimum Firefox version of the add-on is specified by 45 (although it should not).
I fixed the add-on to run on Firefox 45 and will update it to version 0.0.4. However, it could take sometimes to be official.
Could you upgrade your Firefox to the latest version (version 46)?