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>[...] for those using non-WebKit browsers, here's a slightly modified version that will do the trick for you [...]

All four are grey in Firefox for Android.

Same in desktop Firefox. Does the attack not work against Firefox or did he mess up the CSS?

I'm assuming he just didn't thoroughly test the Firefox version of this exploit.

In theory it can be made to work, the browser has to have some kind of rounding mode for opacity.

It could be solved by making the up/down rounding random.