The Mozilla SVG project is again calling for testing of another patch for SVG functionality:
It looks like SVG Events made it into Firefox 1.5, but it's not clear whether textPath or filters would make it into the branch (Firefox 1.5) or if it would just remain in the trunk (Firefox 2.0 development branch). Go download the latest nightly trunk build (i.e. Firefox 2.0 development branch) and test it out.