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Display the country flag of a current Web site's server on your status bar.
Lazarus: Form Recovery restores text and entire Web-form entries after accidental deletion; Clippings and Textarea Cache let you save what you type into text boxes for easy reuse. Plus, add-ons that clear form fields and show a site's nationality.
A Firefox extension shows where a website is located.
When it comes to email the message is always "buyer beware".
Is an IP address personal? Does it point to you? Yes and No.
About some recent defensive computing suggestions
About IP addresses and physical locations.