HowTo enable 1Password app to browser connection with Vivaldi

I use 1Password and KeePassXC as password managers (and can recommend both!). Recently, I needed to overcome an issue blocking the 1Password browser plugin from connecting with the 1Password app. As it turned out, the connection was blocked from the 1Password app, because the browser I was using (vivaldi) is not in the official-supported list of 1Password. Since Vivaldi is “more or less” Chromium, it should work nevertheless. After some search, I found the solution here. I summarize it in the following (as some kind of notes to myself):

1. Ensure the browser integration is enabled at the 1Password app (Settings -> Browser).
2. Close 1Password app completely.
3. Open a terminal, and run sudo mkdir /etc/1password.
4. vim /etc/1password/custom_allowed_browsers and add in the first line the appropriate name of the browser binary (in this case vivaldi-bin).
5. Ensure the correct permissions: sudo chown root:root /etc/1password/custom_allowed_browsers && sudo chmod 755 /etc/1password/custom_allowed_browsers.
6. Start 1Password again.