A notification extension for Firefox, compatible with https://sinoalice.game-db.tw/timer
Game-db doesn't allow you to get notifications, which makes using it a bit redundant.
Go to the releases page and click on the XPI file of the most recent release.
Firefox will hate you for trying to install from github, but it's cool.
Now navigate to game-db - it should prompt you to allow notifications. It'll probably just be a little icon in the URL bar that shakes when you load the page.
Allow notifications, and then the extension will notify you when there's 5 minutes to go until an event.