[jclem]

The overwhelming majority of the traffic we've seen so far has been Chrome and Safari, even from HN.

That being said, that wasn't necessarily the driving factor in the "use the fancy selection APIs" decision. There were many factors, but for one thing, choosing to use those APIs, while limiting our browser support (for a limited amount of time) helped us get to where we are now at a quicker pace than if we'd opted for much broader browser support from day 1.

One of the challenges here for Firefox is that there's not an API to determine when a user's selection changes. We need this in order for inline markdown to collapse/expand as the cursor comes within proximity of it. It's definitely possible to poly-fill this, we just haven't done it, yet :\ We could disable this for Firefox, but I'd rather ship Firefox support with the rad stuff that the other major browsers already get.

[moron4hire]

It is trivially easy to poll it in an animation loop.