We currently reload the page when the user clicks "Try again" from either the sync-failure or network-offline error state:

        case "view0-sync-error-action":
        case "view0-network-offline-action": {
          this.getWindow().gBrowser.reload();
          break;
        }

However, as the page is essentially just a view onto the state managed by the TabsSetupFlowManager this is likely to change nothing. In the sync-error case we should ensure we are actually refreshing the (tab) sync state - and using SyncedTabs.syncTabs(true) might be a good way to accomplish that.

https://hg.mozilla.org/mozilla-central/rev/40e01a26be95