Webex keeps asking to install addon Rated 2 out of 5 stars

Webex meeting page will keep asking to install addon. If you restart Firefox (54.0.1 (64-bit)) the addon will work and open up the Webex meeting. You have to repeat the process of installing the addon and restarting Firefox for each meeting.

This review is for a previous version of the add-on (1.0.12).