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Afaik Chrome does not support the standard, yet Firefox supports Chome’s API. As a result, most extensions seem to use the Chrome API. Firefox also provides a

• TedDoesntTalk 5y ago
  > Afaik Chrome does not support the standard Chrome published the WebExtensions API, not Mozilla. Whether or not it’s a standard is another question, you could call it a defacto standard, but Chrome definitely implemented the api that they published.
  • syshum 5y ago
    "WebExtensions" is a nebulous term and I can find no where that Chrome calls their API WebExtensions, it is simply the "ChromeAPI" Mozilla as even stopped using the term WebExtensions, instead just going with Extensions [2] The "spec" that most people refer to as WebExtensions, is BrowserExtensions orginally published by Microsoft via W3C [1] [1] https://browserext.github.io/browserext/ https://browserext.github.io/browserext/ [2] https://wiki.mozilla.org/Add-ons/Terminology#Background https://wiki.mozilla.org/Add-ons/Terminology#Background