The linked blog post is six years old (2016).
The linked blog post tells you how to update your code to work with changes made to kraken, six years ago.
Kraken was removed from service as the end of Feburary this year (2022)
For get streams you need to migrate to using
Which will require both a clientID and an access token.
For a Google Chrome Browser extension you would need to do obtain an implicit auth token from the user