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Modify Response 1.0 Requires Restart
Modify HTTP Response Headers. Actually only Content-Type is modified right now, but generic headers come next.
This add-on has been marked as experimental by its developers
This add-on is not compatible with your version of Firefox because of the following:
About this Add-on
To force a content-type, change the modifyresponse.rules preference in about:config. It's a "|"-separated list of "url_regex contenttype_regex contenttype_replacement" entries. See the default value for an example.