Download OpenSync

Name: OpenSync
Author: Ishan

By: Ishan

Download OpenSync (current and past versions) for Firefox

Latest Version: 1.2.6 Updated: 2 months ago

Ready to install?

OpenSync 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 OpenSync 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
1.2.6	XPI · ZIP · Source code	67.42KB	2026-04-07
1.2.5	XPI · ZIP · Source code	66.12KB	2026-03-24
1.2.4	XPI · ZIP · Source code	78.75KB	2026-03-23
1.2.2	Paid users only	76.85KB	2026-03-22
1.1.2	Paid users only	845.52KB	2026-01-28

2026-04-07 · 0 downloads

XPI ZIP Source code

2026-03-24 · 0 downloads

XPI ZIP Source code

2026-03-23 · 0 downloads

XPI ZIP Source code

2026-03-22 · 0 downloads

Paid users only

2026-01-28 · 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 OpenSync ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the OpenSync ZIP file from step 1. OpenSync is now installed on your browser.