Get Company Info: Select a company name or ticker symbol, right-click and choose Get Company Info, and a separate tab opens, showing a financial summary page from Google. There you'll find current stock prices, a price history chart and links to pertinent news stories.

If the company name isn't unique or can't be found, you'll see a list of possibilities from which to choose.

Google Notebook: After finding all of that useful information, perhaps about the competition, you need somewhere to stash and catalog it before composing that insightful memo to the board. Google Notebook not only provides you with a place to easily store selected data, images and links (just click the "Note This" button in the browser's status bar, or manually create a note and paste it in), it also lets you share the notes, and even publish them to a webpage. You can add your own comments and allow colleagues to annotate them as well. You need a Google account (which also lets you use other Google services such as Gmail).

Domain Details: Sometimes you really need to know who actually owns a website. You could check with the domain registrar manually. Or you could install the Domain Details extension, right-click on the page and choose an option from the Domain Info menu. It shows you registration information from WhoIs, detailed information about the page, including its estimated value, information about its network address, and a Google map showing where the server lives.

IE View: If specific webpages don't render properly in Firefox, installing the IE View extension can save your bacon. It allows you to force the offending pages to open in Internet Explorer, even though you initiated them from Firefox. You have the choice of opening the page in IE just once—if, for example, you're testing a newly authored site—or of always opening the page in IE.

Firefox Extension Backup Extension: Finally, once you have all of these wonderful extensions installed, you'll want a way to back them up in case your computer has to be reimaged, or to reproduce your extension configuration on another system.

The Firefox Extension Backup Extension not only backs up your extensions, but it also preserves bookmarks, preferences, passwords, cookies—even your entire profile—either on demand or automatically on a schedule.