Google has said a new security feature in Chrome 67, called Site Isolation, mitigates against Spectre attacks, and similar compromised renderer processes.

It says the facility was running as an experiment since Chrome 63, and now with the bug fixes in place, is fully enabled.

When Site Isolation is enabled, each renderer process contains documents from at most one site. This means all navigations to cross-site documents cause a tab to switch processes. It also means all cross-site iframes are put into a different process than their parent frame, using "out-of-process iframes." Splitting a single page across multiple processes is a major change to how Chrome works,

[security.googleblog.com...]

Site Isolation [chromium.org...]

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