Download Simple Custom CSS

Name: Simple Custom CSS
Author: Nick G.

By: Nick G.

Download Simple Custom CSS (current and past versions) for Firefox

Latest Version: 1.0.6 Updated: a year ago

Ready to install?

Simple Custom CSS is available to install from Firefox Add-ons Store and for download from this page.

View source code

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Available versions

You can find the current and older versions of Simple Custom CSS here. You can download the archived versions or inspect their source codes.

As a free user, you can download up to 3 latest versions.

Upgrade to download older versions

Version	Download	Size	Timestamp
1.0.6	XPI · ZIP · Source code	30.11KB	2025-06-01
1.0.4	XPI · ZIP · Source code	29.53KB	2025-05-30
1.0	XPI · ZIP · Source code	29.01KB	2025-05-25

2025-06-01 · 0 downloads

XPI ZIP Source code

2025-05-30 · 0 downloads

XPI ZIP Source code

2025-05-25 · 0 downloads

XPI ZIP Source code

Install XPI file

An XPI file, short for "XPInstall," is a compressed file format used primarily by Mozilla applications, like Firefox and Thunderbird, to distribute and install add-ons or extensions. These files are similar in function to CRX files for Chrome but cater to the Mozilla ecosystem.

Simply drag-and-drop the XPI into Firefox to install the add-on.

Install ZIP file

Download the Simple Custom CSS ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the Simple Custom CSS ZIP file from step 1. Simple Custom CSS is now installed on your browser.