We know how frustrating it is when the JS extension doesn't work properly, and we're always happy to help you figure out what's going wrong and what needs to be done to get it fixed.
One thing you can check right away, is to see if there is another extension interfering. Lots of times an extension like aihello or Amazons Smile will stop Jungle Scout from working the way it should.
While we love the idea of Amazon Smile (we believe in giving back!), our extensions won't function properly if you are using that feature.
So, in order to take advantage of both the Jungle Scout extension and Amazon Smile, they have to be used separately...with Smile turned off when running your product research, and using Smile when shopping in the Amazon store.
We wish there was a way around this, as we know this isn't ideal...at this point, though, this is the only way to use both.
To check if this is the case you can start by disabling all other extensions. If the JS extension runs without a hitch, you've found the culprit.
But, if it still doesn't work even after disabling the other extensions active on your computer, please email us. We want to make sure you get back up and running as soon as possible! Please create a support ticket, here.