I always use IE. Prefer it but have FF as standby. I'll still be using it and quite happy to do so. I think most browsers will have some vulnerability, it's just when someone finds a weakness then it's usually covered as soon as possible, until they find another one.
IE9 is fine, it's as safe as any other browser in my opinion. Vulnerabilities tend to get talked about, but they usually represent a minimal risk as far as the average computer user is concerned. I certainly have no qualms about using it, although I tend to prefer Chrome - just a personal preference thing more than for any specific reason.
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