Download Billy — Subscription sync

Name: Billy — Subscription sync
Author: Voco, LLC

By: Voco, LLC

Download Billy — Subscription sync (current and past versions) for Firefox

Latest Version: 1.0.55 Updated: a month ago

Ready to install?

Billy — Subscription sync is available to install from Firefox Add-ons Store and for download from this page.

View source code

Available versions

You can find the current and older versions of Billy — Subscription sync 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
1.0.55	XPI · ZIP · Source code	96.73KB	2026-05-09
1.0.44	XPI · ZIP · Source code	92.20KB	2026-05-07
1.0.41	XPI · ZIP · Source code	86.88KB	2026-05-06
1.0.36	Paid users only	73.04KB	2026-05-03
1.0.4	Paid users only	48.84KB	2026-04-25
1.0.3	Paid users only	48.02KB	2026-04-24

2026-05-09 · 0 downloads

XPI ZIP Source code

2026-05-07 · 0 downloads

XPI ZIP Source code

2026-05-06 · 0 downloads

XPI ZIP Source code

2026-05-03 · 0 downloads

Paid users only

2026-04-25 · 0 downloads

Paid users only

2026-04-24 · 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 Billy — Subscription sync ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the Billy — Subscription sync ZIP file from step 1. Billy — Subscription sync is now installed on your browser.