Disable cross domain web security in Firefox

Security Problem Overview

In Firefox, how do I do the equivalent of --disable-web-security in Chrome. This has been posted a lot, but never a true answer. Most are links to add-ons (some of which don't work in the latest Firefox or don't work at all) and "you just need to enable support on the server".

This is temporary to test. I know the security implications.
I can't turn on CORS on the server and I especially would never be able to allow localhost or similar.
A flag, or setting, or something would be a lot better than a plugin. I also tried: http://www-jo.se/f.pfleger/forcecors, but something must be wrong since my requests come back as completely empty, but same requests in Chrome come back fine.

Again, this is only for testing before pushing to prod which, then, would be on an allowable domain.

Security Solutions

Solution 1 - Security

Almost everywhere you look, people refer to the about:config and the security.fileuri.strict_origin_policy. Sometimes also the network.http.refere.XOriginPolicy.

For me, none of these seem to have any effect.

This comment implies there is no built-in way in Firefox to do this (as of 2/8/14).

Solution 2 - Security

From this answer I've known a CORS Everywhere Firefox extension and it works for me. It creates MITM proxy intercepting headers to disable CORS. You can find the extension at addons.mozilla.org or here.

Solution 3 - Security

Check out my addon that works with the latest Firefox version, with beautiful UI and support JS regex: https://addons.mozilla.org/en-US/firefox/addon/cross-domain-cors

Update: I just add Chrome extension for this https://chrome.google.com/webstore/detail/cross-domain-cors/mjhpgnbimicffchbodmgfnemoghjakai

Solution 4 - Security

The Chrome setting you refer to is to disable the same origin policy.

This was covered in this thread also: https://stackoverflow.com/questions/17088609/disable-firefox-same-origin-policy

about:config -> security.fileuri.strict_origin_policy -> false

Solution 5 - Security

I have not been able to find a Firefox option equivalent of --disable-web-security or an addon that does that for me. I really needed it for some testing scenarios where modifying the web server was not possible. What did help was to use Fiddler to auto-modify web responses so that they have the correct headers and CORS is no longer an issue.

The steps are:

Open fiddler.
If on https go to menu Tools -> Options -> Https and tick the Capture & Decrypt https options

Go to menu Rules -> Customize rules. Modify the OnBeforeResponseFunction so that it looks like the following, then save:

 static function OnBeforeResponse(oSession: Session) {
    //....
    oSession.oResponse.headers.Remove("Access-Control-Allow-Origin");
    oSession.oResponse.headers.Add("Access-Control-Allow-Origin", "*");
    //...
 }

This will make every web response to have the Access-Control-Allow-Origin: * header.

This still won't work as the OPTIONS preflight will pass through and cause the request to block before our above rule gets the chance to modify the headers. So to fix this, in the fiddler main window, on the right hand side there's an AutoResponder tab. Add a new rule and response: METHOD:OPTIONS https://yoursite.com/ with auto response: *CORSPreflightAllow and tick the boxes: "Enable Rules" and "Unmatched requests passthrough".

See picture below for reference:

Solution 6 - Security

Best Firefox Addon to disable CORS as of September 2016: https://github.com/fredericlb/Force-CORS/releases

You can even configure it by Referrers (Website).

Solution 7 - Security

While the question mentions Chrome and Firefox, there are other software without cross domain security. I mention it for people who ignore that such software exists.

For example, PhantomJS is an engine for browser automation, it supports cross domain security deactivation.

phantomjs.exe --web-security=no script.js

See this other comment of mine: https://stackoverflow.com/questions/45702427/userscript-to-bypass-same-origin-policy-for-accessing-nested-iframes/46608781#46608781

Solution 8 - Security

For anyone finding this question while using Nightwatch.js (1.3.4), there's an acceptInsecureCerts: true setting in the config file:

firefox: {
      desiredCapabilities: {
        browserName: 'firefox',
        alwaysMatch: {
          // Enable this if you encounter unexpected SSL certificate errors in Firefox
          acceptInsecureCerts: true,
          'moz:firefoxOptions': {
            args: [
              // '-headless',
              // '-verbose'
            ],
          }
        }
      }
    },

Content Type	Original Author	Original Content on Stackoverflow
Question	Oscar Godson	View Question on Stackoverflow
Solution 1 - Security	Peter	View Answer on Stackoverflow
Solution 2 - Security	fireb86	View Answer on Stackoverflow
Solution 3 - Security	Tan Mai Van	View Answer on Stackoverflow
Solution 4 - Security	mightilybix	View Answer on Stackoverflow
Solution 5 - Security	Liviu Trifoi	View Answer on Stackoverflow
Solution 6 - Security	Khado Mikhal	View Answer on Stackoverflow
Solution 7 - Security	Mar Cnu	View Answer on Stackoverflow
Solution 8 - Security	jeti	View Answer on Stackoverflow