Can I create a chrome extension, which can alter or use user data when installed (by permission)?

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Your question is very unclear - what do you mean by "alter or use user data"? What data? Alter in what way? If you can narrow down your question, you might try asking it on Stack Overflow, which is our site for programming help. – nhinkle Jul 20 '11 at 20:11
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closed as off topic by nhinkle Jul 20 '11 at 20:11

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