Bookmarklets
Introduction Bookmarklets are bookmarks with special powers. Effectively, they let you run JavaScript in a browser, which means you can inject JavaScript into a webpage.
The first code block is the bookmarklet itself; create a new bookmark and use this code as the URL. The second code block is the unencoded naked JavaScript; this can be edited then put through the bookmarklet creator found in Useful tools.
Reload webpage on timer Useful for stopping a webpage timing out, which may also log you out.