Information
This policy setting ensures that each website runs in its own process so that a site will not be able to utilize or take data from another running site.
The recommended state for this setting is: Enabled.
Rationale:
Enabling site isolation can help stop sites from inadvertently sharing data with other running sites. This will help protect data from un-trusted sources.
Impact:
None - this is the default behavior.
Solution
To establish the recommended configuration via GP, set the following UI path to Enabled
Computer Configuration\Policies\Administrative Templates\Microsoft Edge\Enable site isolation for every site
Note: This Group Policy path may not exist by default. It is provided by the Group Policy template MSEdge.admx/adml that can be downloaded from Microsoft here.
Default Value:
Enabled.
Note: If this policy is disabled or not configured, a user can opt out of site isolation. (For example, by using 'Disable site isolation' entry in edge://flags.) Disabling the policy or not configuring the policy doesn't turn off Site Isolation.