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About this Add-on
It's useful to avoid the "tag soup" when you are developing a XHTML webpage and want Firefox to use its internal XML parser. If the webserver is not correctly configured, it will serve the page with a "text/html" Content-Type (a tag soup), instead of sending it as "application/xhtml+xml", and therefore avoiding Firefox to treat the page as pure XML.
"Force Content-Type" allows you to define the Content-Type of some URLs (using Regular Expressions), overriding the webserver's incorrect Content-Type.