If you're perplexed by an error in the extension about "insufficient credits", it's most likely referring to Premium credits.
It's likely you either have no premium credits included in your subscription, or you've run out for the month.
It's also likely that you have the automatic premium data unlock feature enabled in the extension:
If you have those check boxes enabled, it means the extension will be doing a search for premium data and trying to spend premium credits on every click of the + or Capture All button.
You can check the amount of premium credits that you have available by hovering your mouse over the circle with your initials on the lower left hand corner of the webapp.
If you have any trouble, please contact our Support team by clicking "Submit a request" at the top right of this page for further assistance.