Sending tabs from Firefox desktop (version 85.0, Windows 10) do not arrive to Firefox for Android (version 84.1.4) - phone does not show notification about new tab. '''What I do''' On desktop: Right click on tab > Send Tab to Device > Firefox on ''<device>''. Next I see blue notification on desktop saying "Sent!" '''Problem''' After I send from desktop I do not see notification on mobile device with new tab arriving. Notification simply never arrives. '''Workaround''' On mobile device: (three dots menu) > Settings > Accounts (My Account) > Sync now. All the tabs that I sent previously will arrive now. I have to do this every time I send tabs from desktop. '''What I have tried''' * Restart Firefox for Android * Disconnect and connect mobile device to account. * Check for updates Are there some additional troubleshooting steps that I can do, e.g. collect logs? '''Other notes''' * This has been happening for a while now, at least couple of months and I am unable to pinpoint when it started. * Sending tab from Firefox for Android to Desktop works instantly. * Bookmarks, Synced tabs and History always sync as expected. * When I am doing the workaround, in Account settings, below "Sync now" text it always says: "Last synced: 0 minutes ago".