I often use Google’s “define:” search tag to find definitions of things from various different sources. It is a good way to find several points of view and not just one dictionary definition. That is why I was happy to find the Define extension for Firefox.
Search the definition of the highlighted text at [...]

Need quick and easy access to a dictionary? Now I might not be the world’s best smeller speller, but with a tool like this I can at least pretend I am. The Dictionary Tooltip extension gives you right-click access to your own personal dictionary. Here are a few more details about how [...]

The folks over at CyberNet News have posted a very detailed look at where microsummaries are going in the new Firefox 3 and what they are exactly. I have had a few people E-mail me and they all seem to be confused by it. Here is the best definition you can find on [...]

Not yet sure what Greasemonkey is all about? Here is one nice guide to get you started.
Greasemonkey is a Firefox extension that allows you to write scripts that alter the web pages you visit. You can use it to make a website more readable or more usable. You can fix bugs that the site [...]