Temporary fix for Evernote web clipper: steps
1. Remove Evernote web clipper Version 6.10.2beta1
2. Select and install Evernote web clipper e.g., Version 6.2.0
https://addons.mozilla.org/en-US/firefox/addon/evernote-web-clipper/versions/
3. Select options > and Automatic Updates and click on 'off'
That's all folks!