Download Synclair

Name: Synclair
Author: MorsMortium

By: MorsMortium Add-on

Download Synclair (current and past versions) for Firefox

Latest Version: 1.4.3 Updated: a year ago

Ready to install?

Synclair 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 Synclair 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
1.4.3	XPI · ZIP · Source code	23.01KB	2025-08-03
1.4.2	XPI · ZIP · Source code	22.22KB	2025-05-17
1.4.1	XPI · ZIP · Source code	22.14KB	2025-05-13
1.3.4	Paid users only	24.61KB	2022-02-05

2025-08-03 · 0 downloads

XPI ZIP Source code

2025-05-17 · 0 downloads

XPI ZIP Source code

2025-05-13 · 0 downloads

XPI ZIP Source code

2022-02-05 · 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 Synclair ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the Synclair ZIP file from step 1. Synclair is now installed on your browser.