Update (4th June, 2020): The original DuckDuckGo (HTML SSL) add-on has been removed. Without this add-on, we cannot force Firefox to use the HTML-only version of DuckDuckGo by default. This article will remain here for posterity.
I recommend that all users of DuckDuckGo install the DuckDuckGo Privacy Essentials add-on, which will set DuckDuckGo as your default search engine whilst helping you protect your privacy.
Fortunately for users of Firefox-based browsers, DuckDuckGo provides a myriad of search engine provider add-ons. Head to
about:preferences‘s search options. In the section titled “One-Click Search Engines”, click the “Find more search engines” hyperlink.
You’ll be redirected to Mozilla’s search engines add-on page. Use the search box at the top of the page to search for “DuckDuckGo”, and you’ll get a pretty long list of results. Everything from DuckDuckGo over TOR to DuckDuckGo with mandatory safe search is available as a one-click search engine.
Use the “Add to Firefox” button to install the add-on. You’ll get a pop-up, as below, to approve it. You can use the checkbox in the pop-up to set your new search engine as your default.
You’re all set! If you go back to the “One-Click Search Engines” settings, you should see
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