To try one of the bookmarklets, drag its green box into your Bookmarks window or toolbar, go to the page that you want it try it out on, and then just click the bookmark. To undo the effects of the bookmarklet just refresh the page.
Delete items from a web page with just a click, this bookmarklet includes an Undo feature (you can try it on this page right now, just click the green box...). This bookmarklet has its own project at GitHub.
Makes any table on a web page sortable. This bookmarklet has its own project at GitHub.
Displays the contents on any password fields on the page. This bookmarklet has its own project at GitHub.
Displays any HTML comments left in the page by the developer.
This pair of bookmarklets can be used to save all the values you enter into a web page, and then restore them again later. These bookmarklets have their own project at GitHub.
Disables any CSS stylesheets referenced by the page
Enable Form Fields
Enables all disabled form fields on the page
Hides any images/objects on the page