Anyone else has the same issue with XHR on Firefox, where it sends shitload of requests and then does something?

Testing the same code on Chromium stuff works just fine, only one request and calls another method. Firefox does free DDOS

@azuredivay Checked my code, seems fine on Chrome. Same thing happens on Microsoft login page.

Running ffox 120 on Windows

How vague do you like your problem description?
@ttomovcik: yes

At this point I'd guess it's probably a silly oversight, never encountered it and been using Firefox for years, maybe an extension? Or some feature that is not supported/ API that follows an earlier spec in different browsers..