After some positive feedback from here [0], I've reworked my anti-anti-debug extension to also work on Firefox in addition to Chrome!
I'm still waiting for the Firefox version to be signed by Mozilla, but you should be able to load it as a temporary extension until then.
What does it do?
Simply put, it will override a few Javascript methods to prevent websites from trying to forcefully prevent usage of the dev tools. Theres more details in the README but its generally a very simple script.
Feel free to give me feedback!