Type about:config instead of a URL and you'll get more configuration options than you'll know what to do with. There'll be a filter window at the top of the screen. Type "tab" in the filter window. You screen should then display only configuration options that contain "tab" in their name. That includes all the "browser.tab" options. You can google on the various "browser.tab" settings to find out what they do. Or you change a setting and play with it to see what it does.

Firefox is immensely configurable. There is also a tabbrowser extensions download that you might want to try. Other tab extensions are available. If you google on firefox tab extensions you should see a lot of options.

Every Firefox user should be aware of about:config options. There are performance tweaks you can make by setting cache options. Have you ever gotten a non-resizable pop-up where the text display is truncated? Using about:config options you can force every window to be resizable, have scroll bars, whatever. The settings will override the web site's javascript. You should be able to configure Firefox to behave just as you desire.

Bill