diff --git a/src/components/structures/MatrixChat.js b/src/components/structures/MatrixChat.js
index de916ad7aa..339ea279ee 100644
--- a/src/components/structures/MatrixChat.js
+++ b/src/components/structures/MatrixChat.js
@@ -1375,7 +1375,8 @@ export default createReactClass({
                 cancelButton: _t('Dismiss'),
                 onFinished: (confirmed) => {
                     if (confirmed) {
-                        window.open(consentUri, '_blank');
+                        const wnd = window.open(consentUri, '_blank');
+                        wnd.opener = null;
                     }
                 },
             }, null, true);
diff --git a/src/components/views/auth/InteractiveAuthEntryComponents.js b/src/components/views/auth/InteractiveAuthEntryComponents.js
index 0b89c82658..aaf8c88440 100644
--- a/src/components/views/auth/InteractiveAuthEntryComponents.js
+++ b/src/components/views/auth/InteractiveAuthEntryComponents.js
@@ -604,6 +604,7 @@ export const FallbackAuthEntry = createReactClass({
             this.props.authSessionId,
         );
         this._popupWindow = window.open(url);
+        this._popupWindow.opener = null;
     },
 
     _onReceiveMessage: function(event) {
diff --git a/src/components/views/messages/TextualBody.js b/src/components/views/messages/TextualBody.js
index d74170919e..ac0fc65ff4 100644
--- a/src/components/views/messages/TextualBody.js
+++ b/src/components/views/messages/TextualBody.js
@@ -374,7 +374,9 @@ export default createReactClass({
                     const height = window.screen.height > 800 ? 800 : window.screen.height;
                     const left = (window.screen.width - width) / 2;
                     const top = (window.screen.height - height) / 2;
-                    window.open(completeUrl, '_blank', `height=${height}, width=${width}, top=${top}, left=${left},`);
+                    const features = `height=${height}, width=${width}, top=${top}, left=${left},`;
+                    const wnd = window.open(completeUrl, '_blank', features);
+                    wnd.opener = null;
                 },
             });
         });