Might be I've been sloppy with adding -moz- to some css rules. Will take a look!
Same, I can see the words (backwards) before clicking a tile. Chrome works fine, except it seems like after a match the first click on a tile doesn't do anything, and I have to click again to make it flip.
The not doing anything is intentional - only when the pair is resolved and the status row goes back to saying "choose a tile" can you click a new tile. This "feature" really needs to be communicated better though, sorry abouy that.