Switching tabs in a hurry? Tab Wheel Scroll is a great add-on for Firefox that allows you to use the mouse’s scroll wheel to switch between open tabs in Firefox. It would be really nice if there was an option for switching tab groups when cycling over the Tab Groups button. Aside from that, this extension is perfect.
Here is a little more about this extension from the developer:
The purpose of this extension is to do one thing and do it well: provide tab switching using the mouse scroll wheel. I have found that while I enjoy all the extra functionality tab-focused extensions provide, tab-bar scrolling is the one function I really miss when it’s gone. Simple preferences are provided for changing the direction of tab switching as well as whether scrolling past the ends of the tab bar wraps around or not. It is based on Dorando’s old miniT extension.
Want to switch tabs with your mouse’s scroll wheel? Pick up Tab Wheel Scroll from the Firefox Add-ons website.