[untog]

I use Containise for that, it lets you set wildcards: https://addons.mozilla.org/en-US/firefox/addon/containerise/

[StavrosK]

Unfortunately that doesn't open other links outside the container :/

[sjagoe]

Temporary containers will do that https://addons.mozilla.org/en-US/firefox/addon/temporary-con...

All urls that are not "pinned" to a container open in a temporary container.