Firefox allows you to assign proxies to individual containers. You could create a "Mullvad" container, set it to use Mullvad's SOCKS proxy and then configure a

Firefox allows you to assign proxies to individual containers. You could create a "Mullvad" container, set it to use Mullvad's SOCKS proxy and then configure a list of websites to always open in that container. That should allow for nice segregation on the level of individual tabs. They haven't documented this feature [1], but it's part of the official "Multi-Account Containers" extension. It can be found in MAC -> Manage Containers -> Select -> Advanced Proxy Settings at the bottom. [1] https://support.mozilla.org/en-US/kb/containers https://support.mozilla.org/en-US/kb/containers