Modifying HTTP response headers in Firefox

Question

Does anyone know if Firefox extensions are allowed to modify HTTP response headers? For example, can an extension remove the x-frame-options header to let the page load in an iframe?

Thanks

Answer 1

I think the best firefox addon for modifying headers is TamperData :

https://addons.mozilla.org/en-US/firefox/addon/966/

Answer 2

S. Wong is correct. Modify Headers supports modification of request headers only at present. However, I am looking at supporting response headers for a future version.