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Technical Limitation
Tom Schuster edited this page Feb 4, 2021
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Firefox WebExtensions are not as powerful as previous legacy extensions, which could use Firefox APIs directly to add new custom search engines.
We use a <link rel="search"> element for Firefox to discover the OpenSearch engine. See also the MDN article Adding search engines from web pages. This method requires that we use a http: or https: URL, and because we also can't locally host a webserver using WebExtensions, the search engine XML file has to be uploaded somewhere.
In previous versions of Firefox with WebExtension support, we used window.external.AddSearchProvider, before that function was disabled.