I agree with other recent reviewers. The screenshot shows a lot of fields, but none of them are enabled unless I "Unlock Advanced Settings" (which are in fact any settings) by providing my email. I know I could use a burner email for that, but meh, whatever. Cheers, bye.

Avoid: requires login to use

An add-on that requires your email to "unlock advanced settings" is never a good add-on.

An addon should not require my email address to do its job unless it's using a third-party relay, and an addon should not use a third party relay without indicating so in the first sentence of the description.

How am I to trust you with my e-mail address if you're either requesting it for no reason or implicitly lying about using a relay?

So happy they ported this from Chrome store. It's very customizable so was able to fix my cross origin sharing issues for testing an internal website.

So glad that they ported this Chrome Extension to Firefox.

This CORS extension is really great and easy to use. Use it often and works. Thanks for creating this extension.