There is a 020+ and a 020+FPU version of IBrowse, and I used to use the FPU version with my 8MB RAM card with FPU. I'm not sure exactly what it's used for, perhaps the image remapping or dithering. In any case, I could definitely tell the difference in speed when using the FPU version instead of the plain 020 version on my 8MB Amiga. I could multitask better, less slowdown.
Interesting. Actually, on reflection, I guess some of the layout calculations could use it, though I had imagined they'd use fixed point.