Apparently extensions for Firefox are easy to write, and hard to make unstable. There are dozens of dozens of them by now, and just a few have "improved" Firefox to the point where I might not use IE except for the few IE required sites that I use (mostly internal facing sites).
For example:
Tab Mix Plus is a spin on the original Tab Mix. Like Tab mix, it enhances Firefox's tab browsing capabilites. It comes included with features such as duplicating tabs, controlling tab focus, undoclosetab and many more. While it may look similar it has a lot more features and added functionality like tab clicking options. Unlike Tab Mix however, it is Mac compatible.
[ Tab Mix Plus ]
Well, I don't know "Tab Mix" from a whole in the wall, but this extension lets you do pretty much anything you can think of to tabs.
Grossberg's beloved Greasemonkey is installed, but I haven't found too much use for it yet. There are tons of "Web Developer" helper extensions, but ColorZilla caught my eye:
With ColorZilla you can get a color reading from any point in your browser, quickly adjust this color and paste it into another program. You can Zoom the page you are viewing and measure distances between any two points on the page. The built-in palette browser allows choosing colors from pre-defined color sets and saving the most used colors in custom palettes. DOM spying features allow getting various information about DOM elements quickly and easily. And there's more...
And, since we all know how much I hate PDFs, it's no surprise I jumped on PDF download. Before I have to read the millions of patent IDs that PDFs are covered by, or risk the instability of a PDF in-place reader, I can use this puppy to download the PDF to my desktop.
Next step: learn how to write my own, so I can create a handy "Blog This" extension like I have for IE.
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Disclaimer The opinions expressed herein are my own personal opinions.