new file mode 100644
--- /dev/null
+++ b/devtools/client/netmonitor/.babelrc
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    "transform-object-rest-spread"
+  ]
+}

--- a/devtools/client/netmonitor/package.json
+++ b/devtools/client/netmonitor/package.json
@@ -16,15 +16,16 @@
     "jszip": "^3.1.3",
     "react": "=15.6.1",
     "react-dom": "=15.6.1",
     "react-redux": "=5.0.3",
     "redux": "^3.6.0",
     "reselect": "^3.0.1"
   },
   "devDependencies": {
+    "babel-plugin-transform-object-rest-spread": "^6.26.0",
     "babel-register": "^6.24.0",
     "file-loader": "^0.10.1"
   },
   "scripts": {
     "start": "node bin/dev-server"
   }
 }

--- a/devtools/client/netmonitor/src/connector/firefox-connector.js
+++ b/devtools/client/netmonitor/src/connector/firefox-connector.js
@@ -134,17 +134,19 @@ class FirefoxConnector {
       }
       window.off(EVENTS.PAYLOAD_READY, listener);
       this.onReloaded();
     };
     window.on(EVENTS.PAYLOAD_READY, listener);
   }
 
   onReloaded() {
-    this.panel.emit("reloaded");
+    if (this.panel) {
+      this.panel.emit("reloaded");
+    }
   }
 
   /**
    * Display any network events already in the cache.
    */
   displayCachedEvents() {
     for (let networkInfo of this.webConsoleClient.getNetworkEvents()) {
       // First add the request to the timeline.

--- a/devtools/client/netmonitor/yarn.lock
+++ b/devtools/client/netmonitor/yarn.lock
@@ -584,16 +584,23 @@ babel-plugin-transform-flow-strip-types@
 
 babel-plugin-transform-object-rest-spread@^6.22.0:
   version "6.23.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-object-rest-spread/-/babel-plugin-transform-object-rest-spread-6.23.0.tgz#875d6bc9be761c58a2ae3feee5dc4895d8c7f921"
   dependencies:
     babel-plugin-syntax-object-rest-spread "^6.8.0"
     babel-runtime "^6.22.0"
 
+babel-plugin-transform-object-rest-spread@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-object-rest-spread/-/babel-plugin-transform-object-rest-spread-6.26.0.tgz#0f36692d50fef6b7e2d4b3ac1478137a963b7b06"
+  dependencies:
+    babel-plugin-syntax-object-rest-spread "^6.8.0"
+    babel-runtime "^6.26.0"
+
 babel-plugin-transform-runtime@^6.7.5:
   version "6.23.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-runtime/-/babel-plugin-transform-runtime-6.23.0.tgz#88490d446502ea9b8e7efb0fe09ec4d99479b1ee"
   dependencies:
     babel-runtime "^6.22.0"
 
 babel-plugin-transform-strict-mode@^6.24.1:
   version "6.24.1"
@@ -4433,19 +4440,19 @@ require-directory@^2.1.1:
 require-from-string@^1.1.0:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/require-from-string/-/require-from-string-1.2.1.tgz#529c9ccef27380adfec9a2f965b649bbee636418"
 
 require-main-filename@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/require-main-filename/-/require-main-filename-1.0.1.tgz#97f717b69d48784f5f526a6c5aa8ffdda055a4d1"
 
-reselect@^2.5.4:
-  version "2.5.4"
-  resolved "https://registry.yarnpkg.com/reselect/-/reselect-2.5.4.tgz#b7d23fdf00b83fa7ad0279546f8dbbbd765c7047"
+reselect@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/reselect/-/reselect-3.0.1.tgz#efdaa98ea7451324d092b2b2163a6a1d7a9a2147"
 
 resolve@1.1.7:
   version "1.1.7"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.1.7.tgz#203114d82ad2c5ed9e8e0411b3932875e889e97b"
 
 resolve@^1.2.0:
   version "1.3.3"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.3.3.tgz#655907c3469a8680dc2de3a275a8fdd69691f0e5"