Bookmarklet

A Firefox browser with a dialog reading "There are about 2502 words on this page."
Demonstration of a bookmarklet that counts the number of words on the page. The browser shown is Firefox 65.0.2 running on Windows 10.

A bookmarklet is a bookmark stored in a web browser that contains JavaScript commands that add new features to the browser. They are stored as the URL of a bookmark in a web browser or as a hyperlink on a web page. Bookmarklets are usually small snippets of JavaScript executed when a user clicks on them. When clicked, bookmarklets can perform a wide variety of operations, such as running a search query from selected text or extracting data from a table.

Another name for bookmarklet is favelet or favlet, derived from favorites (synonym of bookmark).

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