Merge pull request #746 from SelYui/feature/AG-45944

Update KB with HTTP/3 filtering limitations

Author: SelYui

docs/adguard-for-android/features/low-level-settings.md

@@ -138,6 +138,12 @@ If this setting is enabled, AdGuard will filter requests sent over HTTP/3 in add
 
 **About HTTP/3**: This is the latest version of the HTTP protocol, based on QUIC.
 
+**Limitations**:
+
+- Chrome-based browsers do not accept user certificates, so HTTP/3 filtering is not supported in them.
+- Firefox-based browsers behave similarly by default, but you can set the `network.http.http3.disable_when_third_party_roots_found` option in `about:config` to `false` to allow user certificates for HTTP/3.
+- Safari supports HTTP/3 filtering without additional configuration.
+
 ### Outbound proxy
 
 #### Show the Filter DNS requests setting

docs/adguard-for-mac/solving-problems/advanced-settings.md

@@ -81,6 +81,12 @@ Verifies the authenticity of all certificates for the domain based on Chrome Cer
 
 By setting `true`, you allow AdGuard to filter traffic sent over HTTP/3, the latest version of the HTTP protocol based on QUIC.
 
+**Limitations**:
+
+- Chrome-based browsers do not accept user certificates, so HTTP/3 filtering is not supported in them.
+- Firefox-based browsers behave similarly by default, but you can set the `network.http.http3.disable_when_third_party_roots_found` option in `about:config` to `false` to allow user certificates for HTTP/3.
+- Safari supports HTTP/3 filtering without additional configuration.
+
 #### `network.filtering.localnetwork`
 
 By setting `true`, you enable local network filtering.

docs/adguard-for-windows/solving-problems/low-level-settings.md

@@ -65,6 +65,12 @@ Enable this feature if you want AdGuard to automatically intercept filter subscr
 
 If this option is enabled, AdGuard will filter requests sent over HTTP/3 in addition to other request types.
 
+**Limitations**:
+
+- Chrome-based browsers do not accept user certificates, so HTTP/3 filtering is not supported in them.
+- Firefox-based browsers behave similarly by default, but you can set the `network.http.http3.disable_when_third_party_roots_found` option in `about:config` to `false` to allow user certificates for HTTP/3.
+- Safari supports HTTP/3 filtering without additional configuration.
+
 ### Use redirect driver mode
 
 If this option is enabled, AdGuard intercepts all the traffic and redirects it to the local proxy server for further filtering.