* It isn't fixed. Seems Firefox has some long term problems with unwanted SVG [clipping](https://bugzilla.mozilla.org/show_bug.cgi?id=1056949). I will try to reproduce and file.
* I gave up and did this. I don't get why <svg> doesn't work. WTF?
It worked in every browser I tested.
* The answer is definitely to make the file have some small couple pixel margin around the logo in the svg file (or any other file). There's no real downside to that, as it might just look better that way anyway. There are minor zoom issues with clipping even for png files if they have no margin.