I am looking for a program, web browser extension or website service that can give me some notifications (e.g., email or pop-up) whenever a website isn't down anymore.
Any price, license, web browser and operating system is fine.
Use case: I have to prepare some tax form through https://www.glaciertax.com/, and the website is currently down. I would like to receive a notification whenever it is back online.
I am aware of https://www.downnotifier.com however one can only set a notification when the website becomes off-line and not the contrary:
I have crossposted the question at: