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Detects GPS EXIF information in loaded JPEGs automatically

This add-on scans JPEG images automatically as the browser downloads them to detect when they contain embedded GPS coordinates in their EXIF information. When it finds such an image, it shows an alert and links to a map. It also maintains a history list accessible from its toolbar button.

A useful test for verifying that this works can be done by loading the full size versions of any of the images on this page: https://commons.wikimedia.org/wiki/Category:Media_with_GPS_EXIF