WebsiteFilter

Block websites from being visited. As of Firefox 83 and Firefox ESR 78.5, file: URLs are supported.

Compatibility: Firefox 60, Firefox ESR 60
CCK2 Equivalent: N/A
Preferences Affected: N/A

Values

WebsiteFilter expects an array of Match Patterns, as described in https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Match_patterns. The arrays are limited to 1000 entries each.

• If you want to block all URLs, you can use the value <all_urls> or the pattern *://*/* (matching <scheme>://<host><path>). A single wildcard (*) as a value is not sufficient.
• For specific protocols, use https://*/* or http://*/*.

Windows (GPO)

Software\Policies\Mozilla\Firefox\WebsiteFilter\Block\1 = "<all_urls>"
Software\Policies\Mozilla\Firefox\WebsiteFilter\Exceptions\1 = "http://example.org/*"

Windows (Intune)

OMA-URI:

./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/B_WebsiteFilter_Block

Value (string):

<enabled/> <data id="WebsiteFilter" value="1&#xF000;&#60;all_urls&#62;"/>

OMA-URI:

./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/B_WebsiteFilter_Exceptions

Value (string):

<enabled/>
<data id="WebsiteFilter" value="1&#xF000;http://example.org/*"/>

If you are using custom ADMX and ADML administrative templates in Intune, you can use this OMA-URI instead to workaround the limit on the length of strings. Put all of your JSON on one line.

OMA-URI:

./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/WebsiteFilterOneLine

Value (string):

<enabled/>
<data id="JSONOneLine" value='{"Block": ["<all_urls>"],"Exceptions": ["http://example.org/*"]}'/>

macOS

<dict>
  <key>WebsiteFilter</key>
  <dict>
    <key>Block</key>
    <array>
      <string><all_urls></string>
    </array>
    <key>Exceptions</key>
    <array>
      <string>http://example.org/*</string>
    </array>
  </dict>

</dict>

policies.json

{
  "policies": {
    "WebsiteFilter": {
      "Block": ["<all_urls>"],
      "Exceptions": ["http://example.org/*"]
    }
  }
}

See also

• URI schemes on MDN