The part that shipped was Electrolysis which splits the formerly giant-single-processed Firefox into a set of 1-9 processes which work as task pools for tabs. L

The part that shipped was Electrolysis which splits the formerly giant-single-processed Firefox into a set of 1-9 processes which work as task pools for tabs. Locking one tab hard will lock only that tab, and any others sharing that Electrolysis worker I believe. The new upcoming part is Servo, the rendering engine written in Rust.