Try uninstalling the extension, restart the browser, then reinstall it.

Note that you can find the UUID of all extensions listed on the about:debugging page under "This Firefox".

@zeroknight - updated NP, tried the steps and did not solve the problem. Any other thoughts? Thanks

Did you verify that the moz-extension UUID belongs to NP ? Anything useful in the Browser Console (Ctrl+Shift+J) ?

• https://firefox-source-docs.mozilla.org/devtools-user/browser_console/

I am not that expert and not sure what UUID is in this context. But I have a screen capture of the Browser Console here and nothing obvious belonging to NP

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile.