| Policy Name | Description
| --- | --- |
-| **[`AppAutoUpdate`](#appautoupdate)** | Enable or disable automatic application update.
+| **[`3rdparty`](#3rdparty)** | Set policies that WebExtensions can access via chrome.storage.managed.
+| **[`AppAutoUpdate`](#appautoupdate)** | Enable or disable automatic application update.
| **[`AppUpdateURL`](#appupdateurl)** | Change the URL for application update.
| **[`Authentication`](#authentication)** | Configure sites that support integrated authentication.
| **[`BlockAboutAddons`](#blockaboutaddons)** | Block access to the Add-ons Manager (about:addons).
| **[`UserMessaging`](#usermessaging)** | Don't show certain messages to the user.
| **[`WebsiteFilter`](#websitefilter)** | Block websites from being visited.
+### 3rdparty
+
+Allow WebExtensions to configure policy. For more information, see [Adding policy support to your extension](https://extensionworkshop.com/documentation/enterprise/adding-policy-support-to-your-extension/).
+
### AppAutoUpdate
Enable or disable **automatic** application update.
**Preferences Affected:** N/A
#### Windows (GPO)
-```
Software\Policies\Mozilla\Firefox\ExtensionSettings (REG_MULTI_SZ) =
+```
{
"*": {
"blocked_install_message": "Custom error message.",
**Preferences Affected:** N/A
#### Windows (GPO)
-```
Software\Policies\Mozilla\Firefox\Handlers (REG_MULTI_SZ) =
+```
{
"mimeTypes": {
"application/msword": {
**Preferences Affected:** N/A
#### Windows (GPO)
-```
Software\Policies\Mozilla\Firefox\ManagedBookmarks (REG_MULTI_SZ) =
+```
[
{
"toplevel_name": "My managed bookmarks folder"
**Preferences Affected:** Many
#### Windows (GPO)
-```
Software\Policies\Mozilla\Firefox\Preferences (REG_MULTI_SZ) =
+```
{
"accessibility.force_disabled": {
"Value": 1,