If you have issues installing the Cisco Webex add-on for Firefox:

1. Launch Firefox.
2. Click on the menu icon in the upper right.
3. Click Add-ons and themes.
4. Click Extensions in the left panel.
5. If you see Cisco Webex Extension, click the Remove button.

6. Clear the browser cache and close completely out of all browser windows.
7. Reopen Firefox, and go back to the Extension tab as shown in the steps above.
8. Still, on the Extensions tab, Enter Cisco Webex in the upper-right search box.
9. Click the Cisco Webex Extension link, then click the + Add to Firefox button.
10. Select Add on the confirmation box.
11. Try to join the meeting again.

11. In the address bar, type in about:plugins with no space, and hit Enter.
12. Scroll down and look for "ActiveTouch General Plugin Container" which will show you the "path"  copy the path.
13. Do one of the following:

• Navigate to your My Documents folder on your computer and paste the path.
• Click on the Start (icon) in the search box and paste the path. 

14. Locate the .dll file, then delete it.
15. Return to the about:plugin page, then click the reload button . 

16. Try to rejoin / restart the meeting, it will prompt you to "Allow the plugin "- click on Always Allow.
17. Close and relaunch the browser, then start/join a meeting.

Note: If the file still doesn't show up, go to the folder one by one by following the path, look for the .dll file, and delete it.