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Select text MIME type if no existing MIME type is matched.
Update for a Firefox API change.
Add a "View as" entry in the "Web Developer" App Menu.
Patch by Mathnerd314 (slightly modified).
- better default MIME selection algorithm (in particular if you have set the extensions.openinbrowser.additional_mimes preference).
Content should now be opened in the correct tab (it wasn't the case if you opened background tabs).