Billy — Subscription sync Firefox

Download Billy — Subscription sync

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
VersionDownloadSizeDownload countTimestamp
1.0.55XPI · ZIP · Source code96.73KB02026-05-09
1.0.44XPI · ZIP · Source code92.20KB02026-05-07
1.0.41XPI · ZIP · Source code86.88KB02026-05-06
1.0.36Paid users only73.04KB02026-05-03
1.0.4Paid users only48.84KB02026-04-25
1.0.3Paid users only48.02KB02026-04-24
1.0.55 96.73KB
2026-05-09 · 0 downloads
1.0.44 92.20KB
2026-05-07 · 0 downloads
1.0.41 86.88KB
2026-05-06 · 0 downloads
1.0.36 73.04KB
2026-05-03 · 0 downloads
1.0.4 48.84KB
2026-04-25 · 0 downloads
1.0.3 48.02KB
2026-04-24 · 0 downloads

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

  • 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.

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