Use Firefox Sync Since you mentioned workspaces, also have a look at Floorp. It's based on Firefox but makes the UI more customisable by having workspaces and

Use Firefox Sync Since you mentioned workspaces, also have a look at Floorp. It's based on Firefox but makes the UI more customisable by having workspaces and allowing vertical tabs (without needing another extension). Floorp is also compatible with Firefox Sync. I use a a Linux desktop, a window and a Mac laptop, an android phone and an iPad. Firefox Sync works brilliantly across all. If you don't trust Mozilla, you can also self host your own Firefox Sync server.