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Recently I found that Netscape used quite simple algorithm to generate random number for Message Authentication Code to establish an HTTPS connection (Nestscpe used time, process identification number, and parent-process identification number). So now I wonder what source of seed do modern browsers use to guarantee true randomness?

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In software, there is no such thing as a "true randomness". – quant_dev Sep 19 '11 at 6:17
I see true randomness all the time when I do code review ;) – Terence Johnson Sep 19 '11 at 15:00

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This question and this question over on security.SE have some answers describing sources and the randomness available.

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