Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs that preserve your privacy. Cookies are separated by container, allowing you to use the web with multiple identities or accounts simultaneously.
If you try to set a proxy for a container, and don't provide a port, it will be saved as undefined, also showing in the UI as such. This also makes the proxy fail silently.
If you try to set a proxy for a container, and don't provide a port, it will be saved as undefined, also showing in the UI as such. This also makes the proxy fail silently.