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Mozilla rolls out first AI features in Firefox Nightly, and theyre actually useful.
(blog.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
This is absolutely not how any of this works.
While Mozilla implements the WebExtensions API based on the W3C standard, they are not bound to a 100% verbatim implementation. Like other browser vendors, Mozilla has the flexibility to extend or modify the API as needed, as long as they maintain compatibility with the core standard. Adding new APIs or features to the extension system does not require creating an entirely incompatible engine. Browser vendors often add non-standard extensions to APIs, which can later be proposed for inclusion in the next version of the standard if they prove useful. So, Mozilla can certainly add new APIs to their extension system without making it incompatible with the existing WebExtensions ecosystem. This is not difficult to understand.