CIS 5 Sandbox browser level

What’s a good setting for sandboxing a browser in CIS 5? Liimted or partially limited.

IE can’t even run on anything lower than limited.

Firefox can run on limited but some function may not no longer work.

I set it to partially limited for firefox and it seems to work just fine.

partial limited for firefox would still make sound not to be heard when watching video.

Comodo’s sandbox isn’t SandboxIE and therefore, isn’t made for it. Why do you guys want to keep on doing this?