I have a problem with OneNote Clipper Addon. This one from here https://www.onenote.com/clipper

I am using Firefox as browser. And this addon just stops working. When I click on its icon in the top right nothing happens.
I discovered only one way to get this work: if I clear the cookies related to OneNote from the browser.
When the addon stops working I can't access this site https://www.onenote.com/clipper

I tried to clear cookies, Internet cache from Firefox with Ccleaner and it worked ONCE but then the problem occured again.
I reinstalled the addon. Nothing. I uninstalled Firefox and used Ccleaner to clear all the tracks even from the registry. Then installed again Firefox from ninite www.ninite.com/firefox
And the problem it's the same. Any ideas?
What is the problem with the cookies? Because every time I delete them the addon works again. But it gets frustrating to delete them anytime befone using the addon.