Is it possible to periodically check for new messages and update the favicon badge?
AFAIK memo doesn't have any service that pushes updates. It wouldn't be possible unless I provide a server that pushes updates somehow. Which atm is out of scope for my project
Is it possible to periodically refresh the page?
Yeah but that's not a good idea for UX. I could implement it but let default it to disabled and you can enable it in the settings page.
