What? You don't like the challenge of trying to click on a micron wide checkbox on your new 4k laptop screen? That's half the fun, I say.
In many cases, I use a fontawesome glyph linked to a hidden <input> element to work around this limitation :(
On a 4k screen I find that setting layout.css.devPixelsPerPx to ~2 works better than zooming.
yeah, but that doesn't make checkboxes any bigger either.
Good shout, this seems like a pretty major accessibility bug, bit saddened that as a professional web dev I wasn't aware of it, otherwise I probably would've been applying a standard workaround like @sarciszewski.