I use both Ubuntu 18.04.2 LTS and Deepin 15.9, sharing the same home partition, in order to be able to access my documents from both OSes. Unfortunately, they have both access to the same configuration and user preferences, at least for some applications like Firefox, which runs perfectly on Ubuntu bur crashes on Deepin because of incompatible versions. When I run it again afterwards on Ubuntu it displays Restore Last Session (the one which crashed on Deepin). What can I do to change this in simple instructions suitable for an average user. Thanks.