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From reading the error console, I've noticed that Firefox has several internal protocols, such as chrome: and resource:. What are they used for, and why are they necessary? Are they part of the NPAPI (which I am not familiar with)?

This question is independent of operating system or Firefox version.

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up vote 5 down vote accepted

Firefox's addons include extensions, themes, language packs, and plugins.

The protocols you asked about are Firefox's internal protocols for extensions.

  1. The Chrome URL

  2. Chrome registration -- resource

NPAPI is the API for plugins.

MDN: Plugins

MDN: Gecko Plugin API Reference

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