Thanks for your comment and good luck with your journey.
The extensions in the Firefox Store are just free (stripped) versions of the same software. The only install you need to do is the MasterLingQ zip (Takes care of most extension installations).
Some of the extensions require separate install. This info is available in the Readme
Summary
Note: (You must uninstall Transcribe/Spotify to install the other. They have some conflicts)
Spotify Extension is a separate install → located in Spotify/
Transcribe Extension is a separate install → located in Transcribe/
SelectionImport is a separate install - > located in /SelectionImport
Netflix Tools is a separate install → located in Netflix/
Disney Tools is a separate install → located in Disney/ → See Install Instructions for Disney Addon @ Extension: Rooster Disney+ Tools for LingQ - Language Learning on Disney+
AmazonPrime Tools is a separate install → located in AmazonPrime/-> See Install Instructions for Amazon Addon @
Viki Tools is a separate install → located in Viki/
Weverse Tools is a separate install → located in Weverse/
Funimation Tools is a separate install → located in Funimation/
YleAreena Tools is a separate install → located in YleAreena/