Ff 60.9.0esr, installed the Emojis Keyboard on a Win7 64 bit machine. The keyboard shortcut Ctrl+Shift+E brings up the Firefox console. That's a fail as far as E-K goes, immediate uninstall.
Great idea ruined by too many dialog prompts to "follow us on social media" – INTERRUPTION to work flow to use. Uninstalling after this review is posted.