Bookmarklets: simple plugins for your browser

A bookmarklet is a bookmark whose URL (web address) contains a small program that does something useful with the currently displayed web page. To execute the program, you click on the bookmark.
  • Installation: Usually, a bookmarklet is provided on the web as a link that you drag to your bookmarks bar.
  • Examples of useful bookmarklets:
  • Tip: bookmarklets can be quickly invoked via browser keywords.
A simple example would be the following program inside a URL.
You can click on the link to execute it, you can also add the link to your bookmarks bar.

Update 2011-06-08: Implementing bookmarklets in JavaScript