If you use Mullvad VPN, you can configure a different exit node per Firefox container using the SOCKS5 proxy setting. Each Mullvad server provides SOCKS5 proxy access to every other Mullvad server:
These SOCKS5 proxies are only accessible when Mullvad VPN is on, so the security is no worse than not using the proxy.
Mozilla VPN is a rebranded Mullvad, and both VPNs use the same SOCKS5 proxy mechanism to switch your location. The Multi-Account Containers add-on is better integrated with Mozilla VPN, but the feature works well with Mullvad, too.
https://mullvad.net/en/help/different-entryexit-node-using-w...
These SOCKS5 proxies are only accessible when Mullvad VPN is on, so the security is no worse than not using the proxy.
Mozilla VPN is a rebranded Mullvad, and both VPNs use the same SOCKS5 proxy mechanism to switch your location. The Multi-Account Containers add-on is better integrated with Mozilla VPN, but the feature works well with Mullvad, too.