GVP

@AndyTandy You may want to try the extension in [Pale Moon](https://www.palemoonorg) rather than keep an unsupported browser that won't receive any security patches. It's probably not safe to keep using...

Follow-up: The issue appears to be, at least in part, the changes to **background.js**. Twenty-four "let" statements were changed to "const" statements. For example, lines 18-27 of background.js were changed...

Oh. I was hoping you'd fix the extension so the dialog wouldn't erroneously pop up in Firefox 52 ESR. :-)