Hey guys,
I just stumpled upon a problem that only occured in FireFox, giving me the very unspecific error message "NS_ERROR_FAILURE" when animating an SVG. In Chrome, it worked without a problem.
After spending quite some time trying to find what's wrong, it turned out that there was an element that was hidden via display="none" for testing purposes but that was still being animated with GSAP. I created a simplistic test case, see the Codepen.
In the uncompressed TweenMax.js, it's in line 3000:
b = e.getBBox();
It's not a big issue now that I found out what was going on, but maybe this is something that GSAP could check and then just ignore the animation if the element is not visible anyway, to prevent others to run into this in the future.