Pour avoir DuckDuckGo Fr sans filtre en recherche dans Firefox, créer un fichier nommé duckduckgofr.xml dans /home/?????/.mozilla/firefox/?????.default/searchplugins/
Et mettez ça dedans :
<SearchPlugin xmlns="
http://www.mozilla.org/2006/browser/search/"; xmlns:os="
http://a9.com/-/spec/opensearch/1.1/">;
<os:ShortName>DuckDuckGo fr</os:ShortName>
<os:Description>DuckDuckGo fr</os:Description>
<os:InputEncoding>UTF-8</os:InputEncoding>
<os:Image width="16" height="16">data:image/x-icon;base64,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</os:Image>
<os:Url type="text/html" method="GET" template="
https://duckduckgo.com/">;
<Param name="t" value="lm"/>
<Param name="kp" value="-1"/>
<Param name="kl" value="fr-fr"/>
<Param name="kad" value="fr_FR"/>
<Param name="q" value="{searchTerms}"/>
</os:Url>
</SearchPlugin>