Clippings 5.1.1 no longer pastes to certain fields

I can no longer use Ctrl+Alt+v to paste a value to the search field next to the address field on Firefox 48.0 …nor to the email field on the sign in of one of my online applications. This started occuring in recent weeks. I suspect is related to Clippings 5.1.1 …but I’m not 100% sure. Any help would be appreciated.

Try contacting the developers using the support information in the add-on page.

Thanks!