Based on the article, you have to disable a whole heap of AI features, not a simple optional AI sidebar.
This include things like using AI to assist with rendering/processing of PDF, looking at the flags.
As a Firefox users, this seems very troubling to me.
That’s what the flags seem to have as a subject sure, but my firefox hasn’t spammed AI in my face even once, and I’ve looked at a lot of PDF’s, so clearly it’s not mandatory.