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Why isn't this working for me?

what's the blue thing around the screen?

am DEFINITELY sure it's not hardware because it's working on my SUPER FAST laptop (1.1 Dual Core, intel HD, Firefox 27.0.1)

so am sure YOU did something

the blue thing.... windows XP (it's my work PC, don't ask)

Oh and browser is FireFox 27.0.1

I suppose i'll have to just check this at home to figure out what the fuss is all about