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Rated 3 out of 5 stars
Typical use for me requires Auto-detecting proxy settings by default, then switching back and forth between Manual proxy configuration and Auto-detecting proxy settings.
Looks like it's not possible to revert back to Auto-detect settings...only options available for switching are no proxy, use system proxy settings or manual configuration.
You can use system proxy settings in Firefox and use Auto-detecting proxy settings in IE then Firefox will use Auto-detecting proxy settings.
Terry from My-Proxy