Disable Firefox Same Origin Policy without installing a plugin

Question

Is there a way to disable the same origin policy on the Mozilla Firefox browser by toggling a flag in the browser?

This is strictly for development, for not production use.

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Please note:

A similar question asked 3+ years ago yielded an accepted answer that recommends users to install a plugin. I consider this less secure and more cumbersome than toggling a flag (e.g. in the about:config, or passing a parameter when starting the browser like in Chrome).

Solution 1

There is a boolean in Mozilla Firefox that should allow toggling of the same origin policy called security.fileuri.strict_origin_policy.

Go to about:config in your browser and accept the risk:

Then search for security.fileuri.strict_origin_policy and double click it to toggle it to false like so:

I have not tested this but in my experience, this is the flag controlling the same origin policy.

Solution 2

Rather than directly answer your question, this alternative might be viable if you also have ownership of the server

Get your server to add the following response header. (+ Apply a DevOps process or piece of code to ensure only apply this code during development)

Access-Control-Allow-Origin

.. With the value of your origin domain, e.g. http://example.com or alternatively * for all domains.