Ali Lokhandwala - 2007-09-09

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This is a known issue. Because the extension changes mailnews.headers.extraExpandedHeaders. This is the same thing enigmail does. You can delete the extra headers added to this pref manually from about:config.

When uninstall is done thunderbird just blows out the extensions folder on restart. The extension is not notified of this and so cannot take any action to reverse any setting changes.

I'll see if there is a workaround to this, though I doubt it