Recently I removed StackAlert Firefox addon from my apps list in StackExchange. Now when I reinstall it, it is not authenticating and giving message

key is not valid for passed access_token..

How can I get rid of this issue?

1 Answer 1


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 edit Firefox configuration using about:config.

In that, reset the following settings which makes the extension work again.

  1. extensions.stackalert.access_token
  2. extensions.stackalert.error_details
  3. extensions.stackalert.inbox_contents

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