Firefox supports CSS Containment behind preference

[lxender]

Firefox supports CSS Containment behind "css.layout.contain.enabled" true or false since Firefox 47. I tried to edit it, but I guess it failed because I am not authenticated to do that. (I'm new to Github tho, so something else could be the error.) When I edited it, I put:

      "47":"n d #2",
      "48":"n d #2",
      "49":"n d #2",
      "50":"n d #2",

and created a note:

"2":"Can be enabled through the \"layout.css.contain.enabled\" preference in about:config"

[Schweinepriester]

I believe this issue is obsolete, given the age but also because https://caniuse.com/css-containment by now shows what you requested:

[Fyrd]

Closing as per above.