There are many ways you can customize Firefox to make it fit your personal needs. Don’t like the fact that the tabs are just a little rounded, and wish they were more rounded? No need to try to find a theme that fits your needs. I have for you, four ways to round off your tabs in Firefox using the Stylish extension. You can round off all tabs, one tab corner, just the selected tab or forget about all this rounded stuff and make them all square.
Want to make all of your tabs more rounded inside of Firefox? This user style will help you get that look and feel inside of Firefox.
If you are not that crazy about the idea of having too many rounded edges, you could just round the upper-right of the tab, if needed.
Now, if you have absolute distain for the idea of rounding off your tabs, I have a user style for you too. With this one, you can make the tabs less rounded, and more square.
Last, but not least, you could also decide to round off only the selected tab. The reason for doing this is to help visually make it different from the others so that you can pick it out from the crowd of tabs in your tab toolbar.
You now have more than a few ways to make your tabs stand out from the rest of the crowd.