Thank you - Streetmap works OK and was the reason I abandoned Firefox after the recent update (plus the matter of the sound not working correctly
Firefox support was being ineffective so looking for a solution I discovered Pale Moon and even managed to easily bring across my bookmarks and passwords.
It would be good if the developer of Streetmap would update their add on to pass the variable to Bing maps as well as it does to Google maps but even without this it does make like life simpler.
Why is Pale Moon not in Ubuntu's software center ?