|User since||July 26, 2017|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
still not working Rated 1 out of 5 stars
The WebEx page says an actual Firefox will work. Starting the add-on it claims to need 51 or earlier.
No wonder about the web site statement. It's almost 3 years old.