Doesn't appear to be anything like the simplicity and speed of what Paste Email (Original) was, quick and easy. So frustrated with what Mozilla has done to the browser, no longer quick or easy. Truly can't wait for Brave to come up to speed.
The Mozilla team is rolling out a fix for Firefox which should resolve the certificate issue affecting all add-ons. See their Twitter feed for details: https://twitter.com/mozamo/status/1124627930301255680