Default cutoff (9.5 GiB) for the Chromium storage-headroom strategy.
Chrome's predictable-reported-quota mitigation (default since Chromium 147)
reports navigator.storage.estimate() quota as usage + 10 GiB in a normal
tab but usage + 9 GiB in an incognito tab. The headroom — quota - usage
— is therefore a stable 10 GiB vs 9 GiB. 9.5 GiB is the midpoint: below it
means incognito, above it means normal.
Older Chromium (< 147) reported a small dynamic quota in incognito and a
disk-bound quota (tens-to-hundreds of GiB) in a normal tab, so the same
9.5 GiB cutoff classifies those correctly too.
Default cutoff (9.5 GiB) for the Chromium storage-headroom strategy.
Chrome's
predictable-reported-quotamitigation (default since Chromium 147) reportsnavigator.storage.estimate()quota asusage + 10 GiBin a normal tab butusage + 9 GiBin an incognito tab. The headroom —quota - usage— is therefore a stable 10 GiB vs 9 GiB. 9.5 GiB is the midpoint: below it means incognito, above it means normal.Older Chromium (< 147) reported a small dynamic quota in incognito and a disk-bound quota (tens-to-hundreds of GiB) in a normal tab, so the same 9.5 GiB cutoff classifies those correctly too.