Facebook groups notification on keywords in posts (Chrome extension?)

We need to be able to get an alert when someone posts in a Facebook group with a certain keyword. This can not work with an API and is NOT for group admins, only group members (private and public). The person running this must be a member of the group. It should be a Chrome extension if possible. There is already some Python scripting which does something similar. Ideally when they person is notified it should have a link to the post so they can easily access it. A pop up or email alert is fine. It should refresh the group and check every 10 or 15 minutes. The user may have to have tabs open for each group, this is not preferred but is ok. Different people need to be able to use this program/script or extension. A simple user interface should allow them to type in the keyword or keywords to check. Here is a link to a similar script.
https://github.com/kevinzg/facebook-scraper
I am open to other ideas not mentioned and other ways to scrape the groups.