firefox issue

[leeterry]

Attempting to install it on firefox using the instructions provided but keeps saying it failed to install due to it being a corrupt extension. I tried redownloading the file just in case it was corrupted during dl with no changes. I tried extracting the zip file, deleting the chrome json file, changing the name of the json file for firefox to replace the other one inside, adding it all back to zip, and installing. After that failed I tried to just open the zip provided using windows explorer and editing the files inside to save afterward but got the same message both times.