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What sort of "antiviruses" inject stuff in browsers? Do they inject their own JS? This is the first I've heard of this and would like to know more.

I don't remember which vendors were causing it, but yes, many inject their own JS, causing things to break and exceptions to be thrown.

Here's a StackExchange question: "How to disable Kaspersky Antivirus javascript injection?" [0].

And on Reddit: "PSA: Kaspersky injects remote javascript into all your pages. Even secure ones." [1].

Can also attest to this, had plenty of head-scratching issues before I realized on my home computer using kaspersky why our app was breaking.

Shitty browser extensions mostly. It's like 99% of our sentry errors as well.