Download Cosy Reader

Name: Cosy Reader
Author: Cosy Reader

By: Cosy Reader Add-on

Download Cosy Reader (current and past versions) for Firefox

Latest Version: 1.2.4 Updated: 4 months ago

Ready to install?

Cosy Reader is available to install from Firefox Add-ons Store and for download from this page.

View source code

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Total downloads

Available versions

You can find the current and older versions of Cosy Reader 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
1.2.4	XPI · ZIP · Source code	125.25KB	2026-04-04
1.1.1	XPI · ZIP · Source code	125.85KB	2026-04-01
1.1.0	XPI · ZIP · Source code	125.84KB	2026-04-01
1.0.0	Paid users only	14.74KB	2026-01-17

2026-04-04 · 0 downloads

XPI ZIP Source code

2026-04-01 · 0 downloads

XPI ZIP Source code

2026-04-01 · 0 downloads

XPI ZIP Source code

2026-01-17 · 0 downloads

Paid users only

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