Yes, but I did want to sync my installed extensions, just in a way that the extension layout was preserved without further intervention, and not interrupting the initial flow with all the "extension installed" tabs. I will always want to install uBlock and my password manager in every Firefox instance, for example, so that seems like a perfect use case for sync. Plus, some extensions have a lot of config that would be a hassle to copy over every time (like Redirector).
Now that I think about it, I don't remember Sync handling syncing extension settings on top of install state.
