The most popular and feature rich CORS tool on Chrome (over 100K weekly active users) is rebuilt for Firefox with more features.
This plugin allows you to send cross-domain requests. You can also override Request Origin and CORS headers.
Moesif Origin & CORS Changer - A Firefox Add-On for Cross-Domain Requests
Moesif Origin & CORS Changer is a versatile Firefox add-on widely used by developers. It enables sending of cross-domain requests, overriding of Request Origin and CORS headers. It’s a Firefox adaptation of the widely popular Chrome extension and also allows selective enabling for white-listed domains, adding incredible utility to your browser for managing cross-origin resource sharing (CORS).
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Pros
Customizable
Great for fixing cross origin sharing issues
Easy to use
Cons
Requires email to unlock advanced settings
Support broken on Firefox v86
Most mentioned
Requires email to unlock advanced settings
Ported from Chrome store
Works well for testing internal website
User reviews
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.