Error when posting: "Cross origin request forbidden"

Since a few days (maybe 1-2 weeks), when i try to post anything, regardless of content, this rather strange error message pops up. This happens only on my laptop.

This is my configuration:
- Linux, Kernel 5.15.027
- Waterfox classic 2021.01.1 (64-bit edition)
- Extensions: NoScript, AdBlock Plus, Ghostery,

If you need more information about my setup, please ask.
One of those add-ons or possibly Waterfox itself (maybe due to a privacy setting) is probably removing the Origin header from requests which it really shouldn't.
cors fucking up everyone's shit like always lol

> - Linux, Kernel 5.15.027

that's one ancient kernel

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