Installation

A UserCSS compatible userstyle manager is required, common ones include:

Stylus for Firefox, Chrome or Opera.
Cascadea for Safari.
xStyle for Firefox or Chrome.
Stylem for Pale Moon¹.

Mobile:
Stylus for Firefox Nighly (using this)

Then:

²

Footnotes

1. Stylem on Pale Moon forum ↩

2. It supports automatic updates. ↩