--- a/toolkit/components/extensions/parent/ext-telemetry.js
+++ b/toolkit/components/extensions/parent/ext-telemetry.js
@@ -15,110 +15,84 @@ const SCALAR_TYPES = {
   boolean: Ci.nsITelemetry.SCALAR_TYPE_BOOLEAN,
 };
 
 this.telemetry = class extends ExtensionAPI {
   getAPI(context) {
     return {
       telemetry: {
         submitPing(type, payload, options) {
-          return new Promise((resolve, reject) => {
-            try {
-              TelemetryController.submitExternalPing(type, payload, options);
-              resolve();
-            } catch (ex) {
-              reject(new ExtensionUtils.ExtensionError(ex));
-            }
-          });
+          try {
+            TelemetryController.submitExternalPing(type, payload, options);
+          } catch (ex) {
+            throw new ExtensionUtils.ExtensionError(ex);
+          }
         },
         canUpload() {
-          return new Promise((resolve, reject) => {
-            // Note: remove the ternary and direct pref check when
-            // TelemetryController.canUpload() is implemented (bug 1440089).
-            try {
-              const result = ("canUpload" in TelemetryController) ?
-                TelemetryController.canUpload() :
-                Services.prefs.getBoolPref(TelemetryUtils.Preferences.FhrUploadEnabled, false);
-              resolve(result);
-            } catch (ex) {
-              reject(new ExtensionUtils.ExtensionError(ex));
-            }
-          });
+          // Note: remove the ternary and direct pref check when
+          // TelemetryController.canUpload() is implemented (bug 1440089).
+          try {
+            const result = ("canUpload" in TelemetryController) ?
+              TelemetryController.canUpload() :
+              Services.prefs.getBoolPref(TelemetryUtils.Preferences.FhrUploadEnabled, false);
+            return result;
+          } catch (ex) {
+            throw new ExtensionUtils.ExtensionError(ex);
+          }
         },
         scalarAdd(name, value) {
-          return new Promise((resolve, reject) => {
-            try {
-              Services.telemetry.scalarAdd(name, value);
-              resolve();
-            } catch (ex) {
-              reject(new ExtensionUtils.ExtensionError(ex));
-            }
-          });
+          try {
+            Services.telemetry.scalarAdd(name, value);
+          } catch (ex) {
+            throw new ExtensionUtils.ExtensionError(ex);
+          }
         },
         scalarSet(name, value) {
-          return new Promise((resolve, reject) => {
-            try {
-              Services.telemetry.scalarSet(name, value);
-              resolve();
-            } catch (ex) {
-              reject(new ExtensionUtils.ExtensionError(ex));
-            }
-          });
+          try {
+            Services.telemetry.scalarSet(name, value);
+          } catch (ex) {
+            throw new ExtensionUtils.ExtensionError(ex);
+          }
         },
         scalarSetMaximum(name, value) {
-          return new Promise((resolve, reject) => {
-            try {
-              Services.telemetry.scalarSetMaximum(name, value);
-              resolve();
-            } catch (ex) {
-              reject(new ExtensionUtils.ExtensionError(ex));
-            }
-          });
+          try {
+            Services.telemetry.scalarSetMaximum(name, value);
+          } catch (ex) {
+            throw new ExtensionUtils.ExtensionError(ex);
+          }
         },
         recordEvent(category, method, object, value, extra) {
-          return new Promise((resolve, reject) => {
-            try {
-              Services.telemetry.recordEvent(category, method, object, value, extra);
-              resolve();
-            } catch (ex) {
-              reject(new ExtensionUtils.ExtensionError(ex));
-            }
-          });
+          try {
+            Services.telemetry.recordEvent(category, method, object, value, extra);
+          } catch (ex) {
+            throw new ExtensionUtils.ExtensionError(ex);
+          }
         },
         registerScalars(category, data) {
-          return new Promise((resolve, reject) => {
-            try {
-              // For each scalar in `data`, replace scalar.kind with
-              // the appropriate nsITelemetry constant.
-              Object.keys(data).forEach(scalar => {
-                data[scalar].kind = SCALAR_TYPES[data[scalar].kind];
-              });
-              Services.telemetry.registerScalars(category, data);
-              resolve();
-            } catch (ex) {
-              reject(new ExtensionUtils.ExtensionError(ex));
-            }
-          });
+          try {
+            // For each scalar in `data`, replace scalar.kind with
+            // the appropriate nsITelemetry constant.
+            Object.keys(data).forEach(scalar => {
+              data[scalar].kind = SCALAR_TYPES[data[scalar].kind];
+            });
+            Services.telemetry.registerScalars(category, data);
+          } catch (ex) {
+            throw new ExtensionUtils.ExtensionError(ex);
+          }
         },
         setEventRecordingEnabled(category, enabled) {
-          return new Promise((resolve, reject) => {
-            try {
-              Services.telemetry.setEventRecordingEnabled(category, enabled);
-              resolve();
-            } catch (ex) {
-              reject(new ExtensionUtils.ExtensionError(ex));
-            }
-          });
+          try {
+            Services.telemetry.setEventRecordingEnabled(category, enabled);
+          } catch (ex) {
+            throw new ExtensionUtils.ExtensionError(ex);
+          }
         },
         registerEvents(category, data) {
-          return new Promise((resolve, reject) => {
-            try {
-              Services.telemetry.registerEvents(category, data);
-              resolve();
-            } catch (ex) {
-              reject(new ExtensionUtils.ExtensionError(ex));
-            }
-          });
+          try {
+            Services.telemetry.registerEvents(category, data);
+          } catch (ex) {
+            throw new ExtensionUtils.ExtensionError(ex);
+          }
         },
       },
     };
   }
 };