Firefox has added collections to the choice of useful extensions since the last time I looked at this topic. Collections bring together related extensions. So here is my latest list of worthwhile collections and stand-alone tools.

1. Reference Desk

Reference Desk is good for students or anyone who needs to research information. It installs DeeperWeb, which navigates through Google search results using tag-cloud techniques; SimilarWeb for finding related sites; the Converter unit, time zone and currency converter; the Merriam-Webster dictionary; the Wired-Marker highlighter; ScrapBook for saving and organising sites; Reframe It for connecting and sharing your thoughts online; and Read It Later for saving sites for browsing another time.

2. Web Developer's Toolbox

Web Developer's Toolbox will help speed up your development process with extensions for troubleshooting, editing and debugging web projects.

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