HN user
My guess as to what's new here is... nothing.
I'm thinking they will change the containers preference to default to on, and if the extension enabled the preference before maybe that's being removed. Otherwise the containers functionality in Firefox or the extensions in the extensions remain exactly as they were before.
So you still need the extension as it has the critical functionality of Ctrl-Shift-1 to open a new tab of the first container type.
My understanding is that the slowness comes from program code being removed from memory to free up space, forcing the system to constantly re-read it from disk. I still get the slowness without swap.
Comments from the author on the subject: https://imgur.com/gallery/CVq5bO8/comment/1698922551
I am careful. I worked with my company's IP department to get a clear. I had to sit with a company lawyer to explain my video game.
Also they are COMPLETELY different industries. So they didn't care. It was the weirdest meeting that laywer had ever had at my company.
Something like uMatrix can be used by the client, and Content Security Policy combined with Subresource Integrity can be used by the publisher.