@leocg Yes, it's Very uncommon for a browser without any add-on, wallet or specific additional resource activated to add code to a page.

So, I appreciate your input, but I think you should let someone who knows the answer to the problem to help me, thank you.

@leocg It's something that will pop-up at your face if you are using a web app which does an integrity check before clear the user access.

And it's happening even with Lucid Mode deactivated (but in this case, it's putting a blank <style> tag and nothing else, but enough to be blocked by an integrity check).

@leocg Probably is a "bug" already solved in versions beyond the stable one. It's good to know, but would be nice to know if there is some way to solve the problem in the current stable version because this injection of code, even being harmless, is causing Opera to not function at all in some web systems who perform an integrity check in the html code before being able to operate.

Opera is injecting this piece of code while navigating:

<style type="text/css" id="operaUserStyle"></style>

I would like to know why, and how can I make it stop.

Started recently, probably around the version 94.0.4606.65, but it's still happening in the current version 94.0.4606.76.

Steps to reproduce: you can browse any webpage and Inspect it using Developer Tools... this piece of code will be there. Examples: