XPInstall

Rarity: Common

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Arts and letters

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What Wikipedia says

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.

Excerpt from the Wikipedia article “XPInstall”, under the CC BY-SA 4.0 license. Read the article on Wikipedia