Would be exactly what I was looking for but simply doesn't work. No tab opens at the specified time.

Now the extension works. I don't know why, but maybe the mistake was on my side. The developper could place an item in the FAQs what reasons lead to malfunction of the extension. Anyway, I changed of course the score.

Very good and works as intended. Translations could use some work, and it'd be great if it was possible to organize the to-be opened tabs based on date.