[qutebrowser] Firefox Sync for Qutebrowser

[Henry]

Hello,

I mainly use Qutebrowser, but I use Firefox on my mobile phone. I 
recently had a prompt in Firefox that asked me if I wanted to opt-in to 
Firefox Sync.
I pressed "No" because I thought: "Man, that sounds useful. Sadly, I'm 
using Qutebrowser. Too bad".
Afterward, I thought about it for a bit - this shouldn't be too hard to 
implement, right? It's possible to do this as a userscript or as a 
launcher for Qutebrowser, which does the sync before launching 
Qutebrowser. Or is there a hook for executing a specific userscript on 
startup? Alternatively, I could place the launcher script into 
/usr/bin/local/qutebrowser, but it's probably better to have qutebrowser 
execute it automatically on startup.
I found a few old closed old issues on GitHub regarding this. Is anyone 
aware if anything like this already exists? I don't want to waste my 
time programming something that already exists.

Yours truthfully
Henry