This script allows you to install unsigned extensions (ones that aren't approved by Mozilla) on normal Firefox builds and the official Snap! That's right, no "Firefox Developer Edition" nonsense required!
⚠️ Disclaimer ⚠️
This script is not well tested, like at all. This script might break things, possibly important things. You should probably take a backup of your Firefox profile before using it. You have been warned.
sudo apt install -y curl unzip zip # Only needed when jailbreaking the Snap