XPInstall ○˒｜Definition｜1st｜20261010123349-00-⌔

XPInstall - Wikipedia

XPInstall

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XPInstall (Cross-Platform Install) was a technology used by the Mozilla Application Suite, SeaMonkey, Mozilla Firefox, Mozilla Thunderbird and other XUL -based applications for installing Mozilla extensions that add functionality to the main application.¹ Support for XPInstall was removed from Firefox in November 2017 with the release of Firefox 57.²

Printed 2026-10-10.

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Footnotes

1. File.org (2023-02-24). “XPI File: How to open XPI file (and what it is)”. file.org. Retrieved 2024-02-23. ↩

2. Cimpanu, Catalin. “Old Firefox Add-Ons Will Stop Working in Firefox 57, End of 2017”. BleepingComputer. Retrieved 2025-11-11. ↩