The food lab by j Kenji Lopez alt is another cooking book (with lots of recipes) that really helps you understand why and what you are doing rather than just telling you a process to follow.
Highly recommend anything Kenji does (previously he was the main force behind seriouseats.com) and also does a lot of first person point of view cooking videos on YouTube where he explains why he is doing things while he is doing them.
On chrome you can actually create your own signing key, and then self sign the unpacked extension directory using your key. To remove the pop-up you then need to set up a group policy (on Windows) to trust your self signed extensions. End result is this popup doesn't come up at launch.
I think this is so hidden (and not really documented well) as a "fix" that must have been added for companies that use their own internal extensions that don't publish them on the web store.
If you can't figure it out from that description I can try to publish a step-by-step on how to accomplish this
Highly recommend anything Kenji does (previously he was the main force behind seriouseats.com) and also does a lot of first person point of view cooking videos on YouTube where he explains why he is doing things while he is doing them.