key changes

[jsnapp]

I am using Firefox version 49.0.1 and can access MiVoice just fine.
I go to Users and devices, search for extension, click the link.
On the list of tabs, select keys and click clear all keys.
Then when I click Save changes get a pop up box that says "An error occurred window.showmodaldialog is not a function"
Tried on another device and get the same result.  Beside rebooting phone system, is there another fix?

[ralph]

FF  made a change that makes it incompatible with earlier versions of the 3300.
The easiest thing to do is to download Firefox Portable version 36, install it in its own directory and run it with the -no-remote option.

Ralph