Follow the steps below to deploy the Filter Crome Extension with GPO:
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Download the ADMX templates and follow these instructions to deploy to your domain or to your workstation.

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In your Group Policy Editor, go to Computer Configuration or User Configuration) > Policies > Administrative Templates > Microsoft Edge.
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Select Extensions.
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Go to 'Control which extensions are installed silently (ExtensionInstallForcelist)' and include the Securly Edge extension and any other mandatory extensions.

For the Securly extension, enter the extension ID followed by a semicolon and the custom URL with no spaces. This can be found by navigating to Filter Settings page > Account Details. -
Select 'Configure Enable Extension management settings' and enable Override Update URL by using the following data in the box: {"bmlalgfmolfmkjmnikbphgijefopggme":{"override_update_url":true}}

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Enable “Control Manifest v2 extension availability” and set to "Manifest v2 is enabled"

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"Control which extensions cannot be installed" [ExtensionInstallBlocklist] can be used to block all other extensions (such as VPNs or proxies)
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“Hide the First-run experience and splash screen” can be disabled.

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Diable “Configure InPrivate mode availability” [InPrivateModeAvailability]
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Disable “Enable guest mode” [BrowserGuestModeEnabled].
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Disable “Enable ending processes in the Browser task manager” [TaskManagerEndProcessEnabled]/
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“Browser sign-in settings” [BrowserSignin] may be used to force users to sign in to the browser. This can help with other Office apps.
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Disable “Control where developer tools can be used” [DeveloperToolsAvailability].