.xpi

Firefox extension package, a ZIP archive of add-on code installable in Mozilla Firefox and Thunderbird

Dedicated renderer

Format facts

MIME type

application/x-xpinstall

Apple UTI

custom

Stock Quick Look

a ZIP-based container

Planned approach (census)

special-renderer

Icon hint

generic-icon

Prevalence

common

Renderer note (from the census)

parse ZIP for install.rdf or manifest.json

Census note

Web devs build Firefox extensions; native macOS shows a generic zip icon instead of extension metadata.

Gotchas: browser extension

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