Download sync.js

Name: sync.js
Author: script.js

By: script.js

Download sync.js (current and past versions) for Firefox

Latest Version: 2.3 Updated: a year ago

Ready to install?

sync.js 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 sync.js 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
2.3	XPI · ZIP · Source code	14.48KB	2025-08-07
2.2	XPI · ZIP · Source code	14.39KB	2024-06-22
2.1	XPI · ZIP · Source code	14.40KB	2024-06-19
2.0	Paid users only	17.09KB	2024-02-04
1.0	Paid users only	16.12KB	2024-02-02

2025-08-07 · 0 downloads

XPI ZIP Source code

2024-06-22 · 0 downloads

XPI ZIP Source code

2024-06-19 · 0 downloads

XPI ZIP Source code

2024-02-04 · 0 downloads

Paid users only

2024-02-02 · 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 sync.js ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the sync.js ZIP file from step 1. sync.js is now installed on your browser.