diff --git a/devtools/client/netmonitor/src/request-list-context-menu.js b/devtools/client/netmonitor/src/request-list-context-menu.js
index de6eee992b86..6b1e53b8fdde 100644
--- a/devtools/client/netmonitor/src/request-list-context-menu.js
+++ b/devtools/client/netmonitor/src/request-list-context-menu.js
@@ -126,8 +126,8 @@ RequestListContextMenu.prototype = {
       label: L10N.getStr("netmonitor.context.copyImageAsDataUri"),
       accesskey: L10N.getStr("netmonitor.context.copyImageAsDataUri.accesskey"),
       visible: !!(selectedRequest &&
-               selectedRequest.responseContent &&
-               selectedRequest.responseContent.content.mimeType.includes("image/")),
+               selectedRequest.mimeType &&
+               selectedRequest.mimeType.includes("image/")),
       click: () => this.copyImageAsDataUri(),
     });
 
@@ -164,8 +164,8 @@ RequestListContextMenu.prototype = {
       label: L10N.getStr("netmonitor.context.saveImageAs"),
       accesskey: L10N.getStr("netmonitor.context.saveImageAs.accesskey"),
       visible: !!(selectedRequest &&
-               selectedRequest.responseContent &&
-               selectedRequest.responseContent.content.mimeType.includes("image/")),
+               selectedRequest.mimeType &&
+               selectedRequest.mimeType.includes("image/")),
       click: () => this.saveImageAs(),
     });
 
@@ -200,8 +200,8 @@ RequestListContextMenu.prototype = {
       label: L10N.getStr("netmonitor.context.openInDebugger"),
       accesskey: L10N.getStr("netmonitor.context.openInDebugger.accesskey"),
       visible: !!(selectedRequest &&
-               selectedRequest.responseContent &&
-               selectedRequest.responseContent.content.mimeType.includes("javascript")),
+               selectedRequest.mimeType &&
+               selectedRequest.mimeType.includes("javascript")),
       click: () => this.openInDebugger()
     });
 
@@ -210,9 +210,9 @@ RequestListContextMenu.prototype = {
       label: L10N.getStr("netmonitor.context.openInStyleEditor"),
       accesskey: L10N.getStr("netmonitor.context.openInStyleEditor.accesskey"),
       visible: !!(selectedRequest &&
-               selectedRequest.responseContent &&
                Services.prefs.getBoolPref("devtools.styleeditor.enabled") &&
-               selectedRequest.responseContent.content.mimeType.includes("css")),
+               selectedRequest.mimeType &&
+               selectedRequest.mimeType.includes("css")),
       click: () => this.openInStyleEditor()
     });