I have made a fresh installation of Leap 15 alongside existing 42.2 and 42.3. I do not go the upgrade route for various reasons but mainly to keep the existing version running till the new version is properly set up.

Obviously the various applications not included in standard package need to be installed and others tweaked to use packages from Packman repo etc etc. One of the jobs is setting up the Bookmarks in Firefox. I believe there is a file that can be copied and pasted to achieve this easily. I remember some post mentioning "places.sqlite" but cannot find any such file. Could it be libmozsqlite3.so in the root/usr/lib64/firefox?