Opensearch/Firefox integration [feature,trivial]

[onlyjob]

There is a neat and useful feature that allows to add a search engine to Firefox search bar with just a few clicks.
Most search engines have already adopted the feature.

For instance, Metager.org have the following on the web page:

<link rel="search" type="application/opensearchdescription+xml" title="MetaGer: privacy protected search &amp; find" href="https://metager.org/plugins/opensearch.xml">

https://metager.org/plugins/opensearch.xml contains the following:

<?xml version="1.0" encoding="UTF-8" ?>
<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/" xmlns:moz="http://www.mozilla.org/2006/browser/search/">
        <ShortName> MetaGer (en)  </ShortName>
        <Description>MetaGer: secure search &amp; find, protecting privacy</Description>
        <Image width="16" height="16" type="image/x-icon">https://metager.org/favicon.ico</Image>
        <Url type="text/html" template="https://metager.org/meta/meta.ger3?eingabe={searchTerms}" method="GET" />
        <InputEncoding>UTF-8</InputEncoding>
</OpenSearchDescription>

---

The following example is from Mojeek.com:

<link rel="search" type="application/opensearchdescription+xml" title="Mojeek" href="https://www.mojeek.com/opensearch.xml" />

https://www.mojeek.com/opensearch.xml contains the following:

<?xml version="1.0" encoding="UTF-8"?>
<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/" xmlns:moz="http://www.mozilla.org/2006/browser/search/">
	<ShortName>Mojeek</ShortName>
	<Description>Search the web using Mojeek</Description>
	<InputEncoding>UTF-8</InputEncoding>
	<Image width="16" height="16" type="image/x-icon">https://www.mojeek.com/favicon.png</Image>
	<Url type="text/html" template="https://www.mojeek.com/search?q={searchTerms}"></Url>
		<moz:SearchForm>https://www.mojeek.com</moz:SearchForm>
</OpenSearchDescription>

Reproducing similar declaration would require only a little effort. Thanks.