It is OK, nice and handy with a simple ding - however, it needs more settings since when you close the browser everything reverts back and it starts as silent by default which is annoying so you need to keep switching it back.
I gave it a 2 star since it has some more improvements needed.
Plus, when you are reloading a tab it keeps dinging away till the page finally loads, irritating.
Firstly thank you for taking the time to review my "Add-On" and especially to have left constructive comments. You're the first! It's very appreciated. This tool is a prototype that I developed for me entertainment and I admit it needs a little love. I take note of your considerations and in the meantime, I would like to notify you that if you also want to have fun, sources are available on GitHub;). Have Fun and a Good day and I thank you again.