It is probably partly the age of your OS. I find 10.8.x reasonable for most things. I'm not ready to transition anything to 10.9 quite yet. (I've gotten a lot more conservative in my desire to change my toolset.)
That said, the little balloons are very light grey, with white or slightly light grey numerals inside them. It could just be a poor contrast choice of the website author. No, wait, it is a poor contrast choice of the web authors. And there's a lot of that going around these days.
No, what I'm getting is much more lame than merely the poor design choices of designers too young ever to have heard of presbyopia. (I once worked for an ad agency whose cards were dark gray printed -- well, knocked out -- with fine, white, 6 point type. I handed one of these cards to a client -- an engineer at EMC -- who promptly said, "Nobody over 40 in your company, apparently?) I get rectangles with things like "FO 53" (that's the "Home" button on twitter) in them in lieu of navigational buttons. So probably not only my old age but that of my OS.
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That said, the little balloons are very light grey, with white or slightly light grey numerals inside them. It could just be a poor contrast choice of the website author. No, wait, it is a poor contrast choice of the web authors. And there's a lot of that going around these days.
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