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If I had two different browsers and separated their use such that I was only ever using browser A for things such as on-line banking and credit card purchases etc. And used browser B for everything else, then if browser B got had malicious scripts installed would my browser activities on browser A be safe?

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migrated from stackoverflow.com Dec 6 '12 at 16:48

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Did you read about the recent Tumblr worm? –  Rook Dec 6 '12 at 16:12
    
What type of "malicious installed scripts" do you mean? If you install something which gets file system access, it's your fault –  Bergi Dec 6 '12 at 17:32
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Yes. Since malicious client side scripts have no direct access to the underlying filesystem or OS of the client, they can not be transmitted across browsers.

However, if you have malicious bookmarks or addons installed and voluntarily transfer them, perhaps in ignorance, then the other browser is also vulnerable.

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Depends if "malicious scripts installed" are at an OS level, or at a browser level. If something infects your OS, any application is vulnerable.

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