Test build for #551. Not a release.
Built from fix/551-health-grouped-false-positives at 66734235 (master plus the #551 fix, PR #558). Tab Health no longer flags healthy grouped tabs as broken, so the "Restore N tabs to cache favicons" step shows again when favicons need repair. Also includes the 9.1.0 startup changes from #540.
Unsigned, loaded as an unpacked extension; it does not auto-update. Same extension ID as the Web Store version: it replaces it. Back up your session and settings first and follow the Help test a fix guide. Instructions in #551.