If this policy is enabled, and the website filter is enabled, you can specify match patterns for sites you do not want to block. The match patterns are documented at https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Match_patterns. Only http/https addresses are supported at the moment. There is a 1000 entry limit.
If this policy is disabled or not configured, there are no exceptions to the website filter.
Registry Hive | HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER |
Registry Path | Software\Policies\Mozilla\Firefox\WebsiteFilter\Exceptions |
Value Name | {number} |
Value Type | REG_SZ |
Default Value |