diff --git a/packages/extension-mouse-tracking/src/index.ts b/packages/extension-mouse-tracking/src/index.ts
index cb2aa81c15..37bcc0d23d 100644
--- a/packages/extension-mouse-tracking/src/index.ts
+++ b/packages/extension-mouse-tracking/src/index.ts
@@ -155,8 +155,6 @@ class MouseTrackingExtension implements JsPsychExtension {
     }
 
     return {
-      extension_type: "mouse-tracking",
-      extension_version: version,
       mouse_tracking_data: this.currentTrialData,
       mouse_tracking_targets: Object.fromEntries(this.currentTrialTargets.entries()),
     };
diff --git a/packages/extension-record-video/src/index.ts b/packages/extension-record-video/src/index.ts
index bf6b2ced55..1774cfdbb9 100644
--- a/packages/extension-record-video/src/index.ts
+++ b/packages/extension-record-video/src/index.ts
@@ -58,18 +58,10 @@ class RecordVideoExtension implements JsPsychExtension {
 
       if (!this.currentTrialData.record_video_data) {
         this.onUpdateCallback = () => {
-          resolve({
-            extension_type: "record-video",
-            extension_version: version,
-            ...this.currentTrialData,
-          });
+          resolve(this.currentTrialData);
         };
       } else {
-        resolve({
-          extension_type: "record-video",
-          extension_version: version,
-          ...this.currentTrialData,
-        });
+        resolve(this.currentTrialData);
       }
     });
   };
diff --git a/packages/extension-webgazer/src/index.ts b/packages/extension-webgazer/src/index.ts
index 2f0f7368f2..56f02a4496 100644
--- a/packages/extension-webgazer/src/index.ts
+++ b/packages/extension-webgazer/src/index.ts
@@ -211,8 +211,6 @@ class WebGazerExtension implements JsPsychExtension {
 
     // send back the gazeData
     return {
-      extension_type: "webgazer",
-      extension_version: version,
       webgazer_data: this.currentTrialData,
       webgazer_targets: this.currentTrialTargets,
     };
diff --git a/packages/jspsych/src/ExtensionManager.ts b/packages/jspsych/src/ExtensionManager.ts
index 75802759d2..bafc139bfc 100644
--- a/packages/jspsych/src/ExtensionManager.ts
+++ b/packages/jspsych/src/ExtensionManager.ts
@@ -40,9 +40,28 @@ export class ExtensionManager {
 
   public async initializeExtensions() {
     await Promise.all(
-      this.extensionsConfiguration.map(({ type, params = {} }) =>
-        this.getExtensionInstanceByClass(type).initialize(params)
-      )
+      this.extensionsConfiguration.map(({ type, params = {} }) => {
+        this.getExtensionInstanceByClass(type).initialize(params);
+
+        const extensionInfo = type["info"] as JsPsychExtensionInfo;
+
+        if (!("version" in extensionInfo) && !("data" in extensionInfo)) {
+          console.warn(
+            extensionInfo["name"],
+            "is missing the 'version' and 'data' fields. Please update extension as 'version' and 'data' will be required in v9. See https://www.jspsych.org/latest/developers/extension-development/ for more details."
+          );
+        } else if (!("version" in extensionInfo)) {
+          console.warn(
+            extensionInfo["name"],
+            "is missing the 'version' field. Please update extension as 'version' will be required in v9. See https://www.jspsych.org/latest/developers/extension-development/ for more details."
+          );
+        } else if (!("data" in extensionInfo)) {
+          console.warn(
+            extensionInfo["name"],
+            "is missing the 'data' field. Please update extension as 'data' will be required in v9. See https://www.jspsych.org/latest/developers/extension-development/ for more details."
+          );
+        }
+      })
     );
   }
 
@@ -67,14 +86,14 @@ export class ExtensionManager {
       )
     );
 
-    const extensionInfo = trialExtensionsConfiguration.length
+    const extensionInfos = trialExtensionsConfiguration.length
       ? {
-          extension_type: results.map((result) => result.extension_type),
-          extension_version: results.map((result) => result.extension_version),
+          extension_type: trialExtensionsConfiguration.map(({ type }) => type["info"].name),
+          extension_version: trialExtensionsConfiguration.map(({ type }) => type["info"].version),
         }
       : {};
 
-    results.push(extensionInfo);
+    results.push(extensionInfos);
 
     return Object.assign({}, ...results);
   }