Firefox gives an extension page in a private window locks of its own. A popup there could save between the background's read and its write of the stored record, and undo a network switch the background had saved. manifest/firefox.json now sets "incognito": "not_allowed", so a page in a private window cannot read or write extension storage. tests/manifest.test.js pins the key. The README says this in "Stored state and its version". Six code comments drop their private-window exception to the lock. docs/README.md tells Firefox users that AutistMask does not work in private windows. Model: opus-5-5