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Firefox error message 623 phone book entry not found
When you install Firefox for users with a dial-up internet access you sometimes you get an error message 623 Phone Book Entry Not Found.

This is causes by Firefox not able to read the default dial-up connection in the registry.

You can delete and reassign the default dial-up connections but it does not fix the issue.

Quick Fix:
Open Regedit navigate to

HKEY_CURRENT_USER\Software\Microsoft\RAS Autodial\

Then delete "DefaultInternet" key.

Close and open Firefox again.

Now you will be prompted by Firefox to choose the default internet connection to open.

Quick and dirty but works.

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