How do I prevent the themes that I've installed into Ubuntu from affecting how Firefox looks? Changing the way the window looks is okay, but it's changing the way my tabs, menus and text box areas are looking.
I'm afraid that isn't possible unless there was a feature implemented specifically to do this, since Firefox uses native widgets. For example, an OK button on a dialog will look the same as an OK button in Firefox options. The goal is to make a general look and feel applied for all native apps. You can use themes though to change Firefox's look a little more to your liking.