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Document SanitizeOnShutdown Exceptions (Firefox 154) #237

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Document SanitizeOnShutdown Exceptions (Firefox 154) #237

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1 change: 1 addition & 0 deletions src/content/docs/reference/policies/Cookies.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ Configure cookie preferences.
## Values

- `Allow` is a list of origins (not domains) where cookies are always allowed. You must include `http` or `https`.
As of Firefox 154, using `Allow` to also exempt sites from clearing on shutdown is deprecated. Firefox migrates those origins to the new mechanism, but you should configure [`SanitizeOnShutdown`](/reference/policies/sanitizeonshutdown/)'s `Exceptions` instead.

@bsmth bsmth Jul 27, 2026

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Looks good, minor suggestion:

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As of Firefox 154, using `Allow` to also exempt sites from clearing on shutdown is deprecated. Firefox migrates those origins to the new mechanism, but you should configure [`SanitizeOnShutdown`](/reference/policies/sanitizeonshutdown/)'s `Exceptions` instead.
As of Firefox 154, using `Allow` to exempt sites from clearing on shutdown is deprecated. Firefox migrates origins to the new mechanism, but you should use [`SanitizeOnShutdown`](/reference/policies/sanitizeonshutdown/)'s `Exceptions` instead.

- `AllowSession` is a list of origins (not domains) where cookies are only allowed for the current session. You must include `http` or `https`.
- `Block` is a list of origins (not domains) where cookies are always blocked. You must include `http` or `https`.
- `Behavior` sets the default behavior for cookies based on the following values:
Expand Down
8 changes: 7 additions & 1 deletion src/content/docs/reference/policies/SanitizeOnShutdown.mdx
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Expand Up @@ -10,7 +10,7 @@ Items that can be selectively deleted include browsing & download history, cooki

> [!NOTE] Starting with Firefox 136, `FormData` and `History` are separate data types.

**Compatibility:** Firefox 60, Firefox ESR 60. Object form added in Firefox 68/ESR 68, `Locked` added in 74/68.6, `History` in Firefox 128.\
**Compatibility:** Firefox 60, Firefox ESR 60. Object form added in Firefox 68/ESR 68, `Locked` added in 74/68.6, `History` in Firefox 128, `Exceptions` in Firefox 154.\
**CCK2 Equivalent:** N/A\
**Preferences Affected:** `privacy.sanitize.sanitizeOnShutdown`, `privacy.clearOnShutdown.cache`, `privacy.clearOnShutdown.cookies`, `privacy.clearOnShutdown.downloads`, `privacy.clearOnShutdown.formdata`, `privacy.clearOnShutdown.history`, `privacy.clearOnShutdown.sessions`, `privacy.clearOnShutdown.siteSettings`, `privacy.clearOnShutdown.offlineApps`, `privacy.clearOnShutdown_v2.browsingHistoryAndDownloads` (Firefox 128), `privacy.clearOnShutdown_v2.cookiesAndStorage` (Firefox 128), `privacy.clearOnShutdown_v2.cache` (Firefox 128), `privacy.clearOnShutdown_v2.siteSettings` (Firefox 128), `privacy.clearOnShutdown_v2.formdata` (Firefox 128)

Expand Down Expand Up @@ -38,6 +38,7 @@ Accepts one or more of the following members to clear specific data types:
- `SiteSettings`: Site preferences
- `OfflineApps`: Offline Website Data (_Deprecated - use `Cookies` instead_)
- `Locked`: Prevents the user from changing these preferences.
- `Exceptions`: (Firefox 154) A list of origins (not domains) whose cookies and site data are not cleared on shutdown. You must include `http` or `https`.

## Windows (GPO)

Expand All @@ -57,6 +58,7 @@ Software\Policies\Mozilla\Firefox\SanitizeOnShutdown\History = 0x1 | 0x0
Software\Policies\Mozilla\Firefox\SanitizeOnShutdown\Sessions = 0x1 | 0x0
Software\Policies\Mozilla\Firefox\SanitizeOnShutdown\SiteSettings = 0x1 | 0x0
Software\Policies\Mozilla\Firefox\SanitizeOnShutdown\Locked = 0x1 | 0x0
Software\Policies\Mozilla\Firefox\SanitizeOnShutdown\Exceptions\1 = "https://example.com"
```

## Windows (Intune)
Expand Down Expand Up @@ -188,6 +190,10 @@ Clear specific data types:
<true/> | <false/>
<key>Locked</key>
<true/> | <false/>
<key>Exceptions</key>
<array>
<string>https://example.com</string>
</array>
</dict>
</dict>
```