Recent hiccup was remedied with method two from this site: https://appuals.com/how-to-clear-or-disable-hsts-for-chrome-firefox-and-internet-explorer/

Fantastic addon with all the weather info i need. Thank you.

Edit: 10 days later i had to wipe site prefs again. Its no big deal but i wanted to mention it in case someone runs into this.

So to sum it up all i have to do is wipe site prefs to get this addon working perfectly. Waterfox 2019.10