It simply does not install with Firefox 66.0.3 -- Don't even bother. And if you are outside the U.S. in a non-English-speaking country don't try to get to an English language website for help. Bottom line: even trying to install this is a profound waste of time.

Why the hell does Cisco Webex require "Access your data for all websites" permissions?

Cannot get to work

Does not work, and as far as I can remember, it has never worked properly in Firefox. Always have to download a stand-alone app to run the meeting. Would be nice if the Devs would fix it, seems as though lots of people have this problem...

Le racourci ne s'affiche pas! et malgré plusieurs tentatives, incapable de se connecter!

Webex doesn't work at all on Firefox / Chrome on Linux.

Installed Firefox Add-on from addons.mozilla.org. Navigated to a webinar hosted with webex, and was asked to isntall cisco_webex_add-on.exe. What? So uninstalled the add-on, and installed the exe. Shows as installed. Navigate to the webinar, and am prompted again for add-on installation. This was attempted with Firefox Quantum version 61.0.1. I had to use IE 11, because I couldn't get Firefox and Webex to play nice together. 1 star. Ideally, this add-on would work like most other add-ons, with easy install, and it just works. Would not recommend until you see a youtube video showing you this is working.

So many difficulties trying to install with Firefox on the Mac...

Application hangs at 10% on every Mozilla based browser I've tried.

Caught my girl ducking do mine

Not working the audio with Firefox.

Cisco Web Ex Extension SUCKS, Why am I blocked from using web page www.freedommunitions.com? Before, I did not have a problem getting onto this. There is nothing wrong with this site. So why am I now blocked from it?

Having this extension activated, the audio in Ubuntu 16.04 64bits still does not work. Actually I do not know if the extension comes into operation because there is not something that indicates it.

... still not working with Ubuntu 16.04 and Firefox 57

Doesn't work with Firefox 57 in Ubuntu. There is no support at all for Linux in their site.

doesn't work, bad bad not good