Add-ons no longer work on Firefox 43. Why?

Add-ons Add-on Support
#1

Add - on whose status has been approved is invalidated because it can not be verified.
Please let me know why.
Firefox43

#2

First of all you should update to Firefox 51. Then try again and report if it’s still an issue or not.

#3

thanks.
There was no problem in Firefox 51.