Here is a screen capture of Google opened with Firefox. See that!
And here is a capture of that screen capture in Photoshop. Notice the tools have snowy black color over them. It goes away when you scroll the curser over them, but comes back when start working on something. Weird! I tried re-installing both and they look the same. I'm on an old Power PC G4 with OS X version 10.3.9. Any ideas?
