Ever since FireFox v1.5 was released I've been having problems aligning items above and below the <pre> tag. It insist on inserting extra lines above and/or below the tag which it didn't used to do. I reworked the main page and the GFA-Basic page to get around this problem.
Apparently HighWire does not yet support the <span> tag so now the GFA-Basic page looks messed up. <hint> Hopefully support can be added in future releases. </hint>