Is it safe to install themes from userstyles.org : r/firefox
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Improve The Look of Firefox In GNOME With These 2 Add-Ons - OMG! Ubuntu

Gray 2014 (dark theme Windows 8.1 Update 1) Upd.11 by ezio on DeviantArt

Moving User Styles (Themes) from Stylish 3.x to Stylus

Code Help — How to get a dashboard theme, tumblr logo, etc.

Stylish (@Stylish_Themes) / X

Arnaud R

Firefox Is Getting a Massive Redesign, And This Is What It Looks Like - OMG! Ubuntu

Stylish - Custom themes for any website – Get this Extension for 🦊 Firefox (en-US)

Make Firefox Look Native in Fedora - Fedora Magazine

GitHub Windows Edition: transforming GitHub into Windows 95 - CodeProject

Alternatives to Stylish for Firefox
STYLISH] Remove the extra links from MAL profile, club, and forum pages - Forums
Mozilla Addon Widescreen NEW design (USw)v.139

How to install and manage themes in Firefox
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por adulto (o preço varia de acordo com o tamanho do grupo)