I have hundreds of 'certificates' in options-advanced; do I need them all?

In the tools menu, click options, select advanced icon. Select view certificates. There is a list of hundreds of 'certificate authorities'.
Some are for my online accounts. Many I don't recognize.
Do I need them all? Are they affecting my computer?

Firefox includes quite a few built-in certificates, it is best not to delete them. For a recent list of the built-in certificates see [http://spreadsheets.google.com/pub?key=ttwCVzDVuWzZYaDosdU6e3w&single=true&gid=0&output=html BuiltInCAs-July-2010]

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