It is not very efficient nor is it productive to not be able to seamlessly work between pc's and laptops because only tabs sync. there should be a way to sync entire WINDOWS of tabs so going back and for when we are logged into our firefox accounts is consistent. make this happen for all of us business people and scholars who usually work with multiple tabs open in multiple locations at the same time...
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Some similar ideas here that potentially align with this:
Persistent Sessions: open all/some open tabs on another device
it's not the same thing. the whole window with whatever tabs are open in it should be syncing and able to be pulled up as it is on any device, not just tabs or tab groups. most of us have many different kinds of tabs open so groups is useless in that instance.
Firefox has too many features. I dont know who actually uses multiple windows and wants them to persist. I think many people dont do that. Its kinda "Windows Explorer" like and its weird.
But an opt-in option for that should not hurt.
I haven't touched explorer in probably 20 years because it was horrible then (and probably still is) and use other browsers (mainly firefox), but I myself bounce between 3+ computers, mac and windows, for different programs and processes and work, so do my colleagues, and having this as even a option we can 'turn on' where it does this would be a HUGE thing.