If you happen to use Google's applications and tools, here's a very handy Firefox extension to install (and it works with version 3.5): GButts. After checking out the visual tour of GButts at The How-To Geek blog, and more input from Lifehacker, I loaded it, and it is indeed a very convenient way to set up an easy-to-access launchpad for your various Google tools and applications. It's a very simple extension, and here's how I customized my installation of it.
 After you install GButts and restart Firefox, go to your Downloads window, find the GButts download, and click on the Options button. This will pull up a Settings menu that lists the many Google applications, and you can check the ones that you want to show up when you click on your GButts toolbar button. Notice that at the bottom of this screenshot, I've selected that I want my GButts button to display a Dropdown menu of Google applications, and I want the orientation to be Vertical:
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After clicking OK above, I just right-click on my Firefox toolbar, and select Customize, then grab the GButts button seen below and drag it to my toolbar:
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And voila!, Â the button on my Firefox toolbar seen below, produces a Dropdown menu from which I can go to Google applications. I can click on the Settings button below at any time to add or subtract applications to the menu. GButts is very simple, and the more Google applications you use, the more useful you'll probably find it. (For a look at how GButts works with a horizontal orientation, see The How To Geek's customized installation at the bottom of the post here.)
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