I'm... actually surprised just 10 months ago somebody is still looking at my Firefox theme haha
I'm glad you like the drawing, though it isn't mine, and overall theme, I appreciate that!

And about the art... it's actually the design of a T-Shirt that... doesn't seem like you can buy anymore. I never bought it myself, but the design is fire, and I would undoubtedly buy if it ever comes on sale again!