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The OAuth domain name is the domain name that will be used to restrict the value of the redirect_uri parameter when authenticating from your application. This is done as a security precaution to prevent others from using your API key and redirecting to a domain name that does not match the one specified in the registration form. The API documentation page ...

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 ...