I am using the development version of Ubuntu (18.10) and can confirm that Geolocation does work based on the test page that you have given. The location found, based on IP address, is just a few miles away from my actual location.
Please execute the following command only once, as it will automatically gather debugging information, in a terminal: apport-collect 1780494 When reporting bugs in the future please use apport by using 'ubuntu- bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs. ** Changed in: firefox (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1780494 Title: Firefox 61 Geolocation does not work Status in firefox package in Ubuntu: Incomplete Bug description: Geolocation does not work in Firefox 61 Test page: https://html5demos.com/geo/ I downloaded and tested with official version which works. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1780494/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

