[rockdoe]

The idea being that the main process and content processes should never be on the same core?

I would worry about cross site leakage. From my understanding that would be unavoidable as soon as you have more tabs open than cores, which feels like an unworkable restriction.

Imagine opening a 9th tab and bring told you need to upgrade your 3700X to a 3900X.

[anarazel]

I think there's several levels. As a first step, I'd appreciate reducing the risk of javascript extracting contents from outside the browser. A second step could be to use more granular core scheduling within firefox, to prevent sharing cores that shouldn't be shared. A process/thread hierarchy can create multiple core scheduling groups.

[rockdoe]

>As a first step, I'd appreciate reducing the risk of javascript extracting contents from outside the browser.

But that means essentially reserving a core for the browser only. I don't think that would be shippable by default.