Firefox has several search engines built-in which users of the web browser can use to search the web. Included are major search engines such as Google, Bing or Yahoo, and an option to add other engines by following a link on that page that leads to the Firefox homepage.
The Open Search Fox plugin for Firefox makes it even easier to add search engines, or search boxes, on almost any website to Firefox.
A new option has been added to the right-click menu after installing the Firefox extension. Whenever you right-click on a search box you get the option to "Add OpenSearch plugin". If you select this option you see a short form where you can edit the name and description of the search form which will afterwards be added as a search engine to the search engines in Firefox.
This is great if you would like to add the possibility to search your favorite websites in Firefox directly. You may swap positions of the search engines by clicking on Manage Search Engines.
To open the menu, click on the down arrow on Firefox's search form and select Manage Search Engines from the context menu that opens up. I'm not aware of another solution that lets you access that page.
Once open, you can remove search engines from the list, or change their order of appearance.
Update: The original Open Search add-on for Firefox is no longer available. Firefox users who would like the functionality in their browser can alternatively install the Add To Search Bar extension for the browser which provides the same functionality. As an added benefit, it is hosted on the official Mozilla website and not a third party site (which means added security as Mozilla audits every extension before it becomes fully available on the site).
Once you have installed the add-on and restarted the Firefox browser, you can right-click any search bar on an open web page and select Add to search bar from the options to add it to the list of search engines installed in your version of the browser.
The search engine is now added to your browser, and you can use it by switching to it in the search bar, or by using the Manage Search Engines menu mentioned above.
Note that you find many search engines listed on the Mycroft Project website which you can use as well to add supported search engines to firefox. While you will find many popular search engines here, thousands of them to be precise, the add-on is the better solution in many cases as it works with every single search engine on the Internet.
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