I love the idea of Firefox Multi-Account Containers, however, this add-on requires much improvement. First complaint: I created some custom containers, as opposed to personal or shopping, which have now vanished twice from existence. I use the Facebook and Google Container Add-ons [which work great!] in conjunction with this Add-on, but that shouldn't be a reason for losing my custom containers. The worst part of the vanishing act is that I have no idea why this is happening. My second complaint is that adding a URL to a container is too cumbersome. You should be able to right click on a bookmark and add it to a container, just like you can open it in a new tab, window or private window AND you shouldn't have to confirm that you want it opened in that container upon your second visit to that URL. As it stands now, first you must open a blank tab in your desired container, then click your bookmark or enter the URL, AND THEN CLICK A CHECK BOX ON THE CONTAINERS BUTTON TO ALWAYS OPEN IN THAT CONTAINER, AND++ upon your second visit to that site, you're forced to endure a needless delay screen where you must click the check box confirming your desire to always open that URL in the specified container. Fix these 2 problems and I'll give this add-on 5 stars, but you'll only get 2 from me today.