In firefox 3.0.5:
Edit -> Preferences and select the "advanced" (gear) icon. From there, select the "encryption" tab. Under that tab, click "view certificates" and then "authorities". Select any CA that you want to remove and click "delete".
Yeah a lot of people are still running 32 bit OS's, but almost all desktop hardware now being shipped is 64 bit-- we're in something like the tail end of the Windows 3.x era. I think most serious users will run 64 bit OS's pretty soon. The Mac Pro uses FB-DIMM and has 8 sockets (wish it had 16) and for a big class of data crunching tasks, what matters most is the amount of ram you can throw at it. The recent collapse in ram prices has been amazing. If enough sockets were available we could fit out $5000 boxes (think of a fully loaded Dell Precision or Mac Pro, not exactly a mass market consumer pc, but not a high end Sun server either) with 128GB or maybe even 256GB. That really extends the range of problems you can attack. But, the bottleneck even in server boards seems to always be ram sockets.
I just don't understand why there aren't more consumer boards with a lot more sockets, using FB-DIMM or registered DDR. You have to go to server boards for that ($$$).
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