No matter how many tabs I have, Firefox only shows one item on the taskbar. I'm not talking about the previews when you hover over the item on the taskbar, that works fine. It only displays 2 or more items on the taskbar if I have 2 or more windows open. Is there a way to do this for each tab? Or even more preferably for each tab group?
You can do what you want for all open applications, but not for Firefox specifically, as far as I know (with the traditional methods).
In the windows Task bar options (Right-click Task bar - Properties) you can set the task bar buttons to:
If you change the option to Never combine, each instance of Firefox will open separately and within each you can have a group of tabs. The same rule applies for all other open applications.