Clear "Always open in .." container preference for a specific site

I have a Container named AbcContainer in my Firefox. Lets say, by mistake, I opt for a specific site (say http://example.org) to always open in that container. How do I go about clearing this preference, so that site http://example.org opens in Default Container going forward?

I get the below prompt, when opening http://example.org from Default Container. But, checking the "Remember my decision" checkbox and choosing "Open in Current Container" doesn't yield the desired results.

Solution 1:

1. Open the website from within the container you want to remove it from.
2. Right-click on the container icon to the right of the URL in the address bar.
3. Uncheck the submenu item "Always open in this container"

Solution 2:

There is an option to configure in Container's management panel manage lists

1. Open Containers add-on
2. Click "Manage Containers"
3. Choose the container you want to manage
4. Click "Manage Site List..."

Now you are able to remove the sites.