I just realized that I haven’t shared this nifty Firefox feature to some of the people I know and it surprises me sometimes that they do not know this yet, so let me just talk about it briefly.
Add a keyword to this search is one of the options that appear when you right click on search fields (e.g. Google’s search field).

Firefox - Add a keyword to this search
It allows you to assign keywords to site searches, so you can simply type “<keyword> + <query string>” in the Location/Address Bar instead of going to the site first before searching or instead of using the Search Toolbar. For example, I can add a keyword “gi”for the Google Images search field, type “gi puppies” in the Location Bar, and it will automatically direct me to the Google Images search results page for my “puppies” query.
To set-up a keyword for a site search, simply right click at the search field of your chosen site and click “Add a Keyword for this Search”, which opens up a New Bookmark dialog box. Enter the name of the search site (e.g. Google Images) and the corresponding keyword (e.g. gi). You can leave the Folder with its default value, but you may also want to create a specific folder in your bookmarks so all your search shortcuts are neatly organized in one folder. Click the Save button and try searching from the Location Bar using your new search shortcut.
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