Pinterest Dark & Amoled Theme For Firefox от Yuilix

This extension aims to provide a real Pinterest Dark theme experience

Keep in mind this project is in beta and will remain in beta for so long
because it is hard to maintain but it does what it says and has cool features such as:

Features:

Adjustable screen brightness
Local Vault (added to avoid unwanted violations made by pinterest)
Toggle Themes between pure dark to a lighther gray color

All settings can be enabled/disabled through settings

Latest version notice:

v1.0.4 brings gray theme option and some new fixes