You Can Add Custom Buttons To Your Browser That Do Whatever "Bookmarklets" are an underutilized and frankly little-known feature in Chrome and Firefox (and probably most other browsers too) that allows you to create a bookmark that contains a little bit of JavaScript instead of a link to a web page. That doesn't seem too exciting, but combined with the ability to put bookmarks on a bookmark toolbar, we can create custom buttons that can take arbitrary action within the context of the currentl...
