How to remove Canonical referral in Firefox?

As title; I want to remove the Canonical referral when I search DuckDuckGo. I can’t find anything relevant in about:config when I search ‘refer’ or ‘Canonical’. Thanks in advance.

The question which is important here is why do you want to remove the canonical referral ?

Why is that important?

The referral helps (in parts at least) to keep the ubuntu server infastructure to keep alive. So you need a very good reason to deactivate that.

I honestly don’t mean to sound facetious but I would’ve thought the fact that I want to do it is reason enough; this isn’t Windows, this is Linux.

However I understand if you’re unwilling to assist. I’ll find my own solution.