Some webpages have a lot of checkboxes, but do not provide “Check All” button. Here comes a solution for this. You will use the following link to create a bookmark in your browser to help you check all of them at once.
To install, simply drag the following links into your Firefox toolbar:
To use it, just open up the page with checkboxes you want to check. Click on the bookmark on the toolbar you just added. Then you will see the magic 😉
Works in Firefox and Safari 4 on any web page.