You will need to contact its support. Have you tried to update it?

Yes, I removed the add-on and re-installed the latest version, but it still does not work. Are you certain that this is not a setting in my Firefox that might be the problem? I have searched for the answer myself and nothing points to the add-on from google as the problem, but there are others that point to Firefox as the problem.

Try to disable multi-process tabs in Firefox.

You can disable multi-process tabs in Firefox by setting the related prefs to false on the about:config page.

• browser.tabs.remote.autostart = false
• browser.tabs.remote.autostart.2 = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

I gave it a try, but it still does not work. Did I have to do a re-boot or anything after changing the prefs?

A reboot would not hurt.

Type about:addons<enter> in the address bar to open your Add-ons Manager. Hot key; <Control>(Mac=<Command>)<Shift> A)

Locate the add-on. Is there any notice for it?