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Your best bet is to completely uninstall and then reinstall Firefox 43. There is no problem with it after the config changes you referenced.

You can place an order today and schedule it for next month when the new Hopper is available. I think that would lock in the deal.

Military History Channel, One America News Channel, Heroes and Icons Channel

Please note that the workaround will not work with FireFox 44, no override allowed. Best not to update beyond 43 until the issue is completely resolved.

There is a work around that you can try. This is should allow you to open the plug-in. For Firefox 43.0 In the address bar type: "about:config" A message will pop up for dangers of the these options agree to them if you would like to continue. Search for "xpinstall.signatures.required"...