I have 3 laptops. 2 for different jobs, and 1 for private use. I have bookmarks that I want to have everywhere, and other bookmarks that should not be other laptops. It is a confidentiality issue if I'm working with someone on my computer, open the browser and search for 'Openshift' or something, and display the name of confidential projects of the other job. No browser helps in this task.
The same remark applies to passwords.
I'd like the option to create sub-accounts and decide which one to synchronize on which laptop, ideally with multiple possibilities for more flexibility (create one or multiple shared sub-accounts), with the option to define a local default, so that all my passwords and bookmarks goes there unless I decide it otherwise.