Blurple Dark por non_performing

A Firefox theme. Uses dark and blurple colors.

Updates
~~~~~~~~~~
v1.0 - First release ~ Major update
v1.3 - Adjusted tab loading text and modified toast menu. ~ Minor update ~ Unreleased
v2.0 - Changed background ~ Major update
v2.2 - Changed text to be more easy to read ~ Minor update
v2.5 - Changed tab selection to be more visible and easy to see ~ Minor Update