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Notice for Firefox 78+: Due to changes made by Mozilla, the add-on is now less convenient. I apologize for the inconvenience.

You can add a custom search engine to the list of available search engines in the search bar and URL bar.

Your custom search engine requires a name and search URL. Additional fields include an icon, a suggestion URL, POST query parameters, input encoding, and a description.

Icons can be selected from your local computer or specified as a URL pointing to an image.

The extension UI is accessible via a button next to the URL/search bar or through the options in about:addons.

Due to a technical limitation with Firefox WebExtensions, all data entered when creating your custom search engine is uploaded to paste.mozilla.org.