Firefox Sync and import passwords not available

[jpurssey]

The standard installation of Firefox V54 with LinuxLite 3.4 64 bit does not provide the sync function or the password import/export function as can be found on other OS platforms (e.g. Linux Mate).

Can these functions be enabled?
Is this an intentional "feature"?

[Valtam]

Change the theme to Default in Firefox. Tools > Add ons > Appearance > Default, Enable. Restart Firefox.