Addon UUID replacer for themes modifying about:addons

[black7375]

Description
A UUID value is required to access and modify the extension's page CSS.
UUID can be identified through about:debugging#/runtime/this-firefox or pref.js(extensions.webextensions.uuid).

Example
Here is an example of running a replacement.

• Shadow Fox
  • Replacer: https://github.com/overdodactyl/ShadowFox/blob/master/scripts/uuids.sh
  • Apply: https://github.com/overdodactyl/ShadowFox/tree/master/css/userContent-files/webextension-tweaks
• Quantum Nox Firefox Dark Full Theme
  • Replacer: https://github.com/Izheil/Quantum-Nox-Firefox-Dark-Full-Theme/tree/master/Installers/Addons%20UUID%20replacer
  • Apply: https://github.com/Izheil/Quantum-Nox-Firefox-Dark-Full-Theme/blob/master/Full%20dark%20theme/addons.css

More Context
IMO, extension ID can to be the target.