5
Have a look to the apps link on your Profile page *.
* or follow this link
2
I found answer myself and posted in my blog post StackAlert Firefox Extension error key is not valid for passed access_token
Solution in brief
When you remove the application from StackExchange apps, and even after uninstalling the extension from Firefox, you will still have traces of that extension in Firefox.
To make this extension work again, we have ...
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