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I love that feature too. It uses the opensearch spec, and shouldn't be hard to implement

Ah wow, I had always wondered what magic was behind this feature! Had no idea there was a spec about it, that makes tons of sense.

Here's a description of the spec, if you are interested: https://developer.mozilla.org/en-US/docs/Web/OpenSearch

Firefox uses it to populate the search bar drop down menu with the available search engines for a site, but it does not add them automatically like Chrome does.

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