diff --git a/components/script/dom/webidls/XRSession.webidl b/components/script/dom/webidls/XRSession.webidl
index 82d3338858f5..1548a68730dc 100644
--- a/components/script/dom/webidls/XRSession.webidl
+++ b/components/script/dom/webidls/XRSession.webidl
@@ -15,7 +15,6 @@ callback XRFrameRequestCallback = void (DOMHighResTimeStamp time, XRFrame frame)
 [SecureContext, Exposed=Window, Pref="dom.webxr.enabled"]
 interface XRSession : EventTarget {
   // // Attributes
-  readonly attribute XRSessionMode mode;
   readonly attribute XREnvironmentBlendMode environmentBlendMode;
 
   // readonly attribute XRVisibilityState visibilityState;
diff --git a/components/script/dom/xrsession.rs b/components/script/dom/xrsession.rs
index d0511c6204db..35593b10a996 100644
--- a/components/script/dom/xrsession.rs
+++ b/components/script/dom/xrsession.rs
@@ -9,7 +9,6 @@ use crate::dom::bindings::codegen::Bindings::NavigatorBinding::NavigatorBinding:
 use crate::dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
 use crate::dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextMethods;
 use crate::dom::bindings::codegen::Bindings::WindowBinding::WindowBinding::WindowMethods;
-use crate::dom::bindings::codegen::Bindings::XRBinding::XRSessionMode;
 use crate::dom::bindings::codegen::Bindings::XRReferenceSpaceBinding::XRReferenceSpaceType;
 use crate::dom::bindings::codegen::Bindings::XRRenderStateBinding::XRRenderStateInit;
 use crate::dom::bindings::codegen::Bindings::XRRenderStateBinding::XRRenderStateMethods;
@@ -296,11 +295,6 @@ impl XRSessionMethods for XRSession {
     /// https://immersive-web.github.io/webxr/#eventdef-xrsession-selectend
     event_handler!(selectend, GetOnselectend, SetOnselectend);
 
-    /// https://immersive-web.github.io/webxr/#dom-xrsession-mode
-    fn Mode(&self) -> XRSessionMode {
-        XRSessionMode::Immersive_vr
-    }
-
     // https://immersive-web.github.io/webxr/#dom-xrsession-renderstate
     fn RenderState(&self) -> DomRoot<XRRenderState> {
         self.active_render_state.get()