Diigo

If often happens that, when you're on a website, you need to make a note about the site or take some of its text. This would normally require a separate application, and more often than not, you'll just forget all about it.

Diigo is an extension for Mozilla Firefox that allows you to make annotations and mark selections of text or images on a webpage, which you can find whenever you revisit the page.

This is a fantastic foundation with limitless possibility - you can mark your place in a long text to resume reading where you left off, remember the last action on the page, or make note of a task to do the next time you visit it.

All of this makes Diigo a great extension essential to your browser.