v2.3.9 breaks a number of sites including gog because it excessively messes with the is-hidden css class, even when unrelated to facebook.

Not being able to run Facebook Container in private windows greatly limits the usefulness of this extension. I don't like being notified that some content creator shared my opinion with Facebook.

Very helpful

Great idea

Please add the option to select a color, or at least to respect the color selected from the Firefox Multi-Account Containers extension. ("The next time you navigate to Facebook it will load in a new BLUE colored browser tab")