3 files changed, 17 insertions, 18 deletions
diff --git a/ext/js/background/backend.js b/ext/js/background/backend.js
index db7a3c0f..b61f27b1 100644
--- a/ext/js/background/backend.js
+++ b/ext/js/background/backend.js
@@ -49,9 +49,11 @@ import {injectStylesheet} from './script-manager.js';
  */
 export class Backend {
     /**
-     * Creates a new instance.
+     * @param {import('../extension/web-extension.js').WebExtension} webExtension
      */
-    constructor() {
+    constructor(webExtension) {
+        /** @type {import('../extension/web-extension.js').WebExtension} */
+        this._webExtension = webExtension;
         /** @type {JapaneseUtil} */
         this._japaneseUtil = new JapaneseUtil(wanakana);
         /** @type {Environment} */
@@ -80,7 +82,7 @@ export class Backend {
             });
         } else {
             /** @type {?OffscreenProxy} */
-            this._offscreen = new OffscreenProxy();
+            this._offscreen = new OffscreenProxy(webExtension);
             /** @type {DictionaryDatabase|DictionaryDatabaseProxy} */
             this._dictionaryDatabase = new DictionaryDatabaseProxy(this._offscreen);
             /** @type {Translator|TranslatorProxy} */
@@ -1902,8 +1904,7 @@ export class Backend {
      * @param {import('application').ApiMessage<TName>} message
      */
     _sendMessageIgnoreResponse(message) {
-        const callback = () => this._checkLastError(chrome.runtime.lastError);
-        chrome.runtime.sendMessage(message, callback);
+        this._webExtension.sendMessageIgnoreResponse(message);
     }
 
     /**
diff --git a/ext/js/background/background-main.js b/ext/js/background/background-main.js
index 2c19e871..f5871a14 100644
--- a/ext/js/background/background-main.js
+++ b/ext/js/background/background-main.js
@@ -23,7 +23,7 @@ import {Backend} from './backend.js';
 async function main() {
     yomitan.prepare(true);
 
-    const backend = new Backend();
+    const backend = new Backend(yomitan.webExtension);
     await backend.prepare();
 }
 
diff --git a/ext/js/background/offscreen-proxy.js b/ext/js/background/offscreen-proxy.js
index 77f5448a..555c3abc 100644
--- a/ext/js/background/offscreen-proxy.js
+++ b/ext/js/background/offscreen-proxy.js
@@ -16,12 +16,17 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-import {isObject} from '../core/utilities.js';
 import {ExtensionError} from '../core/extension-error.js';
+import {isObject} from '../core/utilities.js';
 import {ArrayBufferUtil} from '../data/sandbox/array-buffer-util.js';
 
 export class OffscreenProxy {
-    constructor() {
+    /**
+     * @param {import('../extension/web-extension.js').WebExtension} webExtension
+     */
+    constructor(webExtension) {
+        /** @type {import('../extension/web-extension.js').WebExtension} */
+        this._webExtension = webExtension;
         /** @type {?Promise<void>} */
         this._creatingOffscreen = null;
     }
@@ -76,16 +81,9 @@ export class OffscreenProxy {
      * @param {import('offscreen').ApiMessage<TMessageType>} message
      * @returns {Promise<import('offscreen').ApiReturn<TMessageType>>}
      */
-    sendMessagePromise(message) {
-        return new Promise((resolve, reject) => {
-            chrome.runtime.sendMessage(message, (response) => {
-                try {
-                    resolve(this._getMessageResponseResult(response));
-                } catch (error) {
-                    reject(error);
-                }
-            });
-        });
+    async sendMessagePromise(message) {
+        const response = await this._webExtension.sendMessagePromise(message);
+        return this._getMessageResponseResult(/** @type {import('core').Response<import('offscreen').ApiReturn<TMessageType>>} */ (response));
     }
 
     /**