diff --git a/devtools/client/netmonitor/src/api.js b/devtools/client/netmonitor/src/api.js
index 306b1532ecc4..62ae9a2aed03 100644
--- a/devtools/client/netmonitor/src/api.js
+++ b/devtools/client/netmonitor/src/api.js
@@ -20,6 +20,12 @@ const {
   getSortedRequests,
 } = require("./selectors/index");
 
+loader.lazyRequireGetter(
+  this,
+  "flags",
+  "devtools/shared/flags"
+);
+
 /**
  * API object for NetMonitor panel (like a facade). This object can be
  * consumed by other panels, WebExtension API, etc.
@@ -228,6 +234,16 @@ NetMonitorAPI.prototype = {
     // with the given requestId.
     this.store.dispatch(Actions.sendCustomRequest(this.connector, requestId));
   },
+
+  /**
+   * Fire events for the owner object. These events are only
+   * used in tests so, don't fire them in production release.
+   */
+  emitForTests(type, data) {
+    if (flags.testing) {
+      this.emit(type, data);
+    }
+  },
 };
 
 exports.NetMonitorAPI = NetMonitorAPI;
diff --git a/devtools/client/netmonitor/src/connector/firefox-connector.js b/devtools/client/netmonitor/src/connector/firefox-connector.js
index e3d32fe17663..f8ece1a04458 100644
--- a/devtools/client/netmonitor/src/connector/firefox-connector.js
+++ b/devtools/client/netmonitor/src/connector/firefox-connector.js
@@ -275,7 +275,7 @@ class FirefoxConnector {
       this.actions.addTimingMarker(event);
     }
 
-    this.emit(EVENTS.TIMELINE_EVENT, event);
+    this.emitForTests(EVENTS.TIMELINE_EVENT, event);
   }
 
   /**
@@ -466,15 +466,16 @@ class FirefoxConnector {
       });
     }
 
-    this.emit(EVENTS.THROTTLING_CHANGED, { profile });
+    this.emitForTests(EVENTS.THROTTLING_CHANGED, { profile });
   }
 
   /**
-   * Fire events for the owner object.
+   * Fire events for the owner object. These events are only
+   * used in tests so, don't fire them in production release.
    */
-  emit(type, data) {
+  emitForTests(type, data) {
     if (this.owner) {
-      this.owner.emit(type, data);
+      this.owner.emitForTests(type, data);
     }
   }
 }
diff --git a/devtools/client/netmonitor/src/connector/firefox-data-provider.js b/devtools/client/netmonitor/src/connector/firefox-data-provider.js
index db85f83119d0..1bf493742f7a 100644
--- a/devtools/client/netmonitor/src/connector/firefox-data-provider.js
+++ b/devtools/client/netmonitor/src/connector/firefox-data-provider.js
@@ -115,7 +115,7 @@ class FirefoxDataProvider {
       );
     }
 
-    this.emit(EVENTS.REQUEST_ADDED, id);
+    this.emitForTests(EVENTS.REQUEST_ADDED, id);
   }
 
   /**
@@ -342,7 +342,7 @@ class FirefoxDataProvider {
    */
   getLongString(stringGrip) {
     return this.webConsoleClient.getString(stringGrip).then(payload => {
-      this.emit(EVENTS.LONGSTRING_RESOLVED, { payload });
+      this.emitForTests(EVENTS.LONGSTRING_RESOLVED, { payload });
       return payload;
     });
   }
@@ -381,7 +381,7 @@ class FirefoxDataProvider {
       channelId,
     });
 
-    this.emit(EVENTS.NETWORK_EVENT, actor);
+    this.emitForTests(EVENTS.NETWORK_EVENT, actor);
   }
 
   /**
@@ -411,7 +411,7 @@ class FirefoxDataProvider {
           statusText: networkInfo.response.statusText,
           headersSize: networkInfo.response.headersSize,
         });
-        this.emit(EVENTS.STARTED_RECEIVING_RESPONSE, actor);
+        this.emitForTests(EVENTS.STARTED_RECEIVING_RESPONSE, actor);
         break;
       case "responseContent":
         this.pushRequestToQueue(actor, {
@@ -437,7 +437,7 @@ class FirefoxDataProvider {
 
     this.onPayloadDataReceived(actor);
 
-    this.emit(EVENTS.NETWORK_EVENT_UPDATED, actor);
+    this.emitForTests(EVENTS.NETWORK_EVENT_UPDATED, actor);
   }
 
   /**
@@ -523,7 +523,7 @@ class FirefoxDataProvider {
 
     // This event is fired only once per request, once all the properties are fetched
     // from `onNetworkEventUpdate`. There should be no more RDP requests after this.
-    this.emit(EVENTS.PAYLOAD_READY, actor);
+    this.emitForTests(EVENTS.PAYLOAD_READY, actor);
   }
 
   /**
@@ -603,7 +603,7 @@ class FirefoxDataProvider {
       .toUpperCase()}`;
 
     // Emit event that tell we just start fetching some data
-    this.emit(EVENTS[updatingEventName], actor);
+    this.emitForTests(EVENTS[updatingEventName], actor);
 
     let response = await new Promise((resolve, reject) => {
       // Do a RDP request to fetch data from the actor.
@@ -651,7 +651,7 @@ class FirefoxDataProvider {
     const payload = await this.updateRequest(response.from, {
       requestHeaders: response,
     });
-    this.emit(EVENTS.RECEIVED_REQUEST_HEADERS, response.from);
+    this.emitForTests(EVENTS.RECEIVED_REQUEST_HEADERS, response.from);
     return payload.requestHeaders;
   }
 
@@ -664,7 +664,7 @@ class FirefoxDataProvider {
     const payload = await this.updateRequest(response.from, {
       responseHeaders: response,
     });
-    this.emit(EVENTS.RECEIVED_RESPONSE_HEADERS, response.from);
+    this.emitForTests(EVENTS.RECEIVED_RESPONSE_HEADERS, response.from);
     return payload.responseHeaders;
   }
 
@@ -677,7 +677,7 @@ class FirefoxDataProvider {
     const payload = await this.updateRequest(response.from, {
       requestCookies: response,
     });
-    this.emit(EVENTS.RECEIVED_REQUEST_COOKIES, response.from);
+    this.emitForTests(EVENTS.RECEIVED_REQUEST_COOKIES, response.from);
     return payload.requestCookies;
   }
 
@@ -690,7 +690,7 @@ class FirefoxDataProvider {
     const payload = await this.updateRequest(response.from, {
       requestPostData: response,
     });
-    this.emit(EVENTS.RECEIVED_REQUEST_POST_DATA, response.from);
+    this.emitForTests(EVENTS.RECEIVED_REQUEST_POST_DATA, response.from);
     return payload.requestPostData;
   }
 
@@ -703,7 +703,7 @@ class FirefoxDataProvider {
     const payload = await this.updateRequest(response.from, {
       securityInfo: response.securityInfo,
     });
-    this.emit(EVENTS.RECEIVED_SECURITY_INFO, response.from);
+    this.emitForTests(EVENTS.RECEIVED_SECURITY_INFO, response.from);
     return payload.securityInfo;
   }
 
@@ -716,7 +716,7 @@ class FirefoxDataProvider {
     const payload = await this.updateRequest(response.from, {
       responseCookies: response,
     });
-    this.emit(EVENTS.RECEIVED_RESPONSE_COOKIES, response.from);
+    this.emitForTests(EVENTS.RECEIVED_RESPONSE_COOKIES, response.from);
     return payload.responseCookies;
   }
 
@@ -728,7 +728,7 @@ class FirefoxDataProvider {
     const payload = await this.updateRequest(response.from, {
       responseCache: response,
     });
-    this.emit(EVENTS.RECEIVED_RESPONSE_CACHE, response.from);
+    this.emitForTests(EVENTS.RECEIVED_RESPONSE_CACHE, response.from);
     return payload.responseCache;
   }
 
@@ -745,7 +745,7 @@ class FirefoxDataProvider {
       mimeType: response.content.mimeType,
       responseContent: response,
     });
-    this.emit(EVENTS.RECEIVED_RESPONSE_CONTENT, response.from);
+    this.emitForTests(EVENTS.RECEIVED_RESPONSE_CONTENT, response.from);
     return payload.responseContent;
   }
 
@@ -758,7 +758,7 @@ class FirefoxDataProvider {
     const payload = await this.updateRequest(response.from, {
       eventTimings: response,
     });
-    this.emit(EVENTS.RECEIVED_EVENT_TIMINGS, response.from);
+    this.emitForTests(EVENTS.RECEIVED_EVENT_TIMINGS, response.from);
     return payload.eventTimings;
   }
 
@@ -771,16 +771,16 @@ class FirefoxDataProvider {
     const payload = await this.updateRequest(response.from, {
       stacktrace: response.stacktrace,
     });
-    this.emit(EVENTS.RECEIVED_EVENT_STACKTRACE, response.from);
+    this.emitForTests(EVENTS.RECEIVED_EVENT_STACKTRACE, response.from);
     return payload.stacktrace;
   }
 
   /**
    * Fire events for the owner object.
    */
-  emit(type, data) {
+  emitForTests(type, data) {
     if (this.owner) {
-      this.owner.emit(type, data);
+      this.owner.emitForTests(type, data);
     }
   }
 }