The Confidential Resource

In Power User 110 - Browser Add-ons I recommended the following two FireFox add-ons:

Tab Mix Plus provides all sorts of Tab options that don’t exist in Firefox.

Internote allows you to create persistent sticky notes on a web page which will be there once you return. Notes are very customizable, and come with many small, useful features. A manager is available, in which you can see all of your saved notes, edit them, print them, and delete them.

Neither of these is compatible with FireFox 3 and no updates are available at this time. It looks like there may be a updated version of Tab Mix Plus at some future time.