Multi Account Container Sync does not work if Add-on syncing is disabled, with no prompt to enable

[adamanldo]

Before submitting a bug report

• I updated to the latest version of Multi-Account Container and tested if I can reproduce the issue
• I searched for existing reports to see if it hasn't already been reported

Step to reproduce

1. Create a profile on one computer with multi-account containers and only Bookmarks, History, and Settings synced in the Firefox account sync settings.
2. Sign into the account on another computer and create some different containers on that computer.
3. Enable sync in the multi-account container settings on both computers.

Actual behavior

When Add-on syncing is disabled, multi-account containers do not sync even if synchronization is enabled in the multi-account container settings on both machines.

Expected behavior

There should be a prompt to let you know that the synchronization will not work unless Add-on synchronization is enabled.

Additional informations

No response

Provide a copy of Troubleshooting Information page (optional)

No response