439 karma · joined March 4, 2012
CSS Grid implementation will start in 2014. A dev has been assigned to it, but I don't know where it stands in its work pile (quite high though). But plans can be changed, so beware...
They won't read you here.
Opera supports it fully and without prefix too.
Webkit tends to be (very) late in unprefixing (they are the only ones with prefix for Animation, Gradients, Transitions nowadays.)
Hopefully WebKit will follow soon (if somebody has the bug#, I'm interested)
Note that Memory consumption is somewhat related to Snappiness: if it is too high, the program will slow down (paging, longer garbage collecting pauses, ...) and feel less snappy.
There is some specific cases with accented Greek diphthongs, where the diacritic position changes in upper and lower case, but Mozilla is working on a fix.