Can you try to long-hold on a book you have not previously opened on your reader in your library and, if you have an option for Coolreader, select to open with Coolreader? If you do no see the option for Coolreader, or the book refuses to open in Coolreader, then I think there is something wrong with the installation of the app.
Your extensions.cfg looks correct. My understanding is that Coolreader does not support PDFs.
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