Not sure how helpful this is but in the past I used a Firefox addon called check 4 change
You can let Firefox monitor a website in the background for change.
A con of this solution is that it only works when Firefox is running.
You could also try to maybe automate it with
Or something like this https://visualping.io/blog/how-to-be-alerted-when-someone-posts-on-facebook/
Changing speed of your mouse pointer? I don’t really get it.