Safari and Firefox crash constantly ...

For about a week, I've been having problems with both Safari and Firefox crashing. They crash any time I go on a page that involves a lot of loading. They crash when the entire page hasn't loaded and I click on something. It's beginning to get in the way of doing important things for school, like it crashed every time I tried to to view a page for a class. Help!

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Orignal From: Safari and Firefox crash constantly ...