I'm really dissatisfied with the email notification feature provided by ProtonMail. After I enabled the notification for incoming emails, I started getting alerts for subscription emails, which disrupted my focus and was incredibly frustrating. So, I ended up developing my own extension to notify me when new emails arrive.

Here are some features of my plugin:

You can toggle email notifications on or off.
You can set filtering criteria to block notifications for less important emails.
If you're also unhappy with the notification feature in the web version of ProtonMail, you might want to check out this Chrome extension: ProtonMail Assistant. Feel free to share your thoughts or suggestions for improvements!