Use Flags, Techniques, Browsers, or Extensions, etc to Completely Disable Privacy and Security?

I want to COMPLETELY DISABLE privacy and security features within my browser.

I’m an SEO so when I go to analyze and audit websites, I want to the browser to not interfere in anyway with the operation of the website. I don’t want it touching anything in terms of headers, blocking content, denying requests, etc.

I recently found out about (https://requestly.io/) and am testing it out to bypass CORS, remove CSP, and to remove X-Frame limitations.

Short of building my own browser, are there other options out there to achieve what I’m looking for? I’ve looked at all the Chrome flags and not much there. Haven’t had time to go through the 7,896 flags in Firefox Nightly yet.

Thanks in advance!