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This is a buggy add-on, to the point of not being functional at all.
They also have the gall to have a monthly subscription service that starts at $2.99. Per month. It goes up to $860 per month, but you can save 50% by buying an annual subscription for the low, low price of $5000. The only significant improvement over the lowest tier is 1 ping per day vs 1 every 3 days. And the lowest tier can "only" ping 100 websites. Like you're going to be using this for more than 3 websites max.
Do not touch this add-on. The two 5-star reviews are likely shills, just like the fake anecdotes on the add-on's website.
more work required
great, love it