### DisableTelemetry
Prevent the upload of telemetry data.
+As of Firefox 83 and Firefox ESR 78.5, local storage of telemetry data is disabled as well.
+
Mozilla recommends that you do not disable telemetry. Information collected through telemetry helps us build a better product for businesses like yours.
**Compatibility:** Firefox 60, Firefox ESR 60\
**CCK2 Equivalent:** `disableTelemetry`\
-**Preferences Affected:** `datareporting.healthreport.uploadEnabled,datareporting.policy.dataSubmissionEnabled`
+**Preferences Affected:** `datareporting.healthreport.uploadEnabled,datareporting.policy.dataSubmissionEnabled,toolkit.telemetry.archive.enabled`
#### Windows (GPO)
```
}
```
### OverrideFirstRunPage
-Override the first run page. If the value is blank, no first run page is displayed.
+Override the first run page. If the value is an empty string (""), the first run page is not displayed.
+
+Starting with Firefox 83, Firefox ESR 78.5, you can also specify multiple URLS separated by a vertical bar (|).
**Compatibility:** Firefox 60, Firefox ESR 60\
**CCK2 Equivalent:** `welcomePage`,`noWelcomePage`\
}
```
### OverridePostUpdatePage
-Override the upgrade page. If the value is blank, no upgrade page is displayed.
+Override the upgrade page. If the value is an empty string (""), no extra pages are displayed when Firefox is upgraded.
**Compatibility:** Firefox 60, Firefox ESR 60\
**CCK2 Equivalent:** `upgradePage`,`noUpgradePage`\
datareporting.policy.
dom.
extensions.
+general.autoScroll (Firefox 83, Firefox ESR 78.5)
+general.smoothScroll (Firefox 83, Firefox ESR 78.5)
geo.
intl.
layout.
network.
places.
print.
+signon. (Firefox 83, Firefox ESR 78.5)
ui.
widget.
```
}
```
### WebsiteFilter
-Block websites from being visited. The parameters take an array of Match Patterns, as documented in https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Match_patterns. Only http/https addresses are supported at the moment. The arrays are limited to 1000 entries each.
+Block websites from being visited. The parameters take an array of Match Patterns, as documented in https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Match_patterns.
+The arrays are limited to 1000 entries each.
+
+As of Firefox 83 and Firefox ESR 78.5, file URLs are supported.
**Compatibility:** Firefox 60, Firefox ESR 60\
**CCK2 Equivalent:** N/A\