This problem seems to now be resolved by two circumstances, at least for me as a Canadian user:
1. Amazon Canada now provides access to the kindle store, so there isn't as much need to visit Amazon.com
2. the app now (in 13.10) takes me to amazon.com
This problem seems to now be resolved by two circumstances, at least for me as a Canadian user:
1. Amazon Canada now provides access to the kindle store, so there isn't as much need to visit Amazon.com
2. the app now (in 13.10) takes me to amazon.com
So it may be ok to mark this as "fix released"...