I made a Firefox persona based on TheInconsistentStandard. I'm not sure how the dimensions work for other people's browsers, since it's specifically set up for mine, but if you want to check it out, you can here: [link]

If you need the personas add-on (which I highly recommend regardless), go here: [link]

Oh yeah, the persona is pretty simple because I didn't want to stuff too many things behind favorites and menus and such.