"View As MIME Type" in Chrome or Firefox [closed]

Question

Is there any way to force either Firefox or Chrome to interpret a loaded resource as a particular MIME type?

For example, the raw code views provided by online SCC interfaces such as Google Code send content as text/plain by default. If I'm looking at an HTML file, I'd like to be able to override this in the browser and view it as text/html.

Are there any extensions or hidden commands for Firefox or Chrome that provide "View as MIME type" functionality?

Answer 1

Shameless plug: I just published a (free) Chrome extension to do just what you ask. It's available on the Chrome web store. It works by listening to the chrome.webRequest.onHeadersReceived event and patching in a custom content-type HTTP header. If you'd like the build it yourself or see how it's implemented, the source is available on GitHub.

Answer 2

For Firefox, there is an add-on provides almost the function you wanted: https://addons.mozilla.org/en-US/firefox/addon/force-content-type/ . No idea if there is a Chrome extension or not.

Even if the functionality exists, I wouldn't recommend you to use it in your example: Arbitrary HTML would have access to google.com domain for cookie and script, which is really really bad in terms of security.