In an effort to simplify the Firefox interface, did you know you can make a few changes in the about:config page to move the close tab buttons around? I’ll show you how to move it to the far right of the browser, in just six easy steps.
Before the tweak (notice the close tab button is on the tab itself)
After the tweak (notice the close tab button has been moved to the far right)
Now what is the secret? You just need to do a little editing in your about:config page.