I see it as a natural transition:

Ad Blocker > Disable Javascript > Disable Cookies

It is simple with uMatrix and it just works. Click on * for global scopes, unselect 1st-party. Rules should be

    * * * block
    * * css allow
    * * frame block
    * * image allow
    * 1st-party frame allow

Still can be tracked by third-party images and css with fingerprinting and IP address...

Of course it does not matter once javascript allowed - youtube tracked me fine without cookies. Private browsing and uBlocks could help only so much.

About firefox containers - why where is no version for those who do not care about broken sites? It is certainly possible - code is there https://hg.mozilla.org/mozilla-central/ - would you use it? Would you build it?