diff --git a/ext/js/data/database.js b/ext/js/data/database.js
index 224233a8..cc4f39f9 100644
--- a/ext/js/data/database.js
+++ b/ext/js/data/database.js
@@ -76,9 +76,7 @@ class Database {
                 return;
             }
 
-            const transaction = this.transaction([objectStoreName], 'readwrite');
-            transaction.onerror = (e) => reject(e.target.error);
-            transaction.oncomplete = () => resolve();
+            const transaction = this._readWriteTransaction([objectStoreName], resolve, reject);
             const objectStore = transaction.objectStore(objectStoreName);
             for (let i = start, ii = start + count; i < ii; ++i) {
                 objectStore.add(items[i]);
@@ -161,9 +159,7 @@ class Database {
 
     delete(objectStoreName, key) {
         return new Promise((resolve, reject) => {
-            const transaction = this.transaction([objectStoreName], 'readwrite');
-            transaction.onerror = (e) => reject(e.target.error);
-            transaction.oncomplete = () => resolve();
+            const transaction = this._readWriteTransaction([objectStoreName], resolve, reject);
             const objectStore = transaction.objectStore(objectStoreName);
             objectStore.delete(key);
             transaction.commit();
@@ -172,10 +168,7 @@ class Database {
 
     bulkDelete(objectStoreName, indexName, query, filterKeys=null, onProgress=null) {
         return new Promise((resolve, reject) => {
-            const transaction = this.transaction([objectStoreName], 'readwrite');
-            transaction.onerror = (e) => reject(e.target.error);
-            transaction.oncomplete = () => resolve();
-
+            const transaction = this._readWriteTransaction([objectStoreName], resolve, reject);
             const objectStore = transaction.objectStore(objectStoreName);
             const objectStoreOrIndex = indexName !== null ? objectStore.index(indexName) : objectStore;
 
@@ -317,4 +310,12 @@ class Database {
             }
         }
     }
+
+    _readWriteTransaction(storeNames, resolve, reject) {
+        const transaction = this.transaction(storeNames, 'readwrite');
+        transaction.onerror = (e) => reject(e.target.error);
+        transaction.onabort = () => reject(new Error('Transaction aborted'));
+        transaction.oncomplete = () => resolve();
+        return transaction;
+    }
 }
diff --git a/ext/js/language/dictionary-database.js b/ext/js/language/dictionary-database.js
index 6b235fb6..50435c51 100644
--- a/ext/js/language/dictionary-database.js
+++ b/ext/js/language/dictionary-database.js
@@ -139,22 +139,37 @@ class DictionaryDatabase {
         return result;
     }
 
-    async deleteDictionary(dictionaryName, progressSettings, onProgress) {
-        const targets = [
-            ['dictionaries', 'title'],
-            ['kanji', 'dictionary'],
-            ['kanjiMeta', 'dictionary'],
-            ['terms', 'dictionary'],
-            ['termMeta', 'dictionary'],
-            ['tagMeta', 'dictionary'],
-            ['media', 'dictionary']
+    async deleteDictionary(dictionaryName, progressRate, onProgress) {
+        if (typeof progressRate !== 'number') {
+            progressRate = 1;
+        }
+        if (typeof onProgress !== 'function') {
+            onProgress = () => {};
+        }
+
+        const targetGroups = [
+            [
+                ['kanji', 'dictionary'],
+                ['kanjiMeta', 'dictionary'],
+                ['terms', 'dictionary'],
+                ['termMeta', 'dictionary'],
+                ['tagMeta', 'dictionary'],
+                ['media', 'dictionary']
+            ],
+            [
+                ['dictionaries', 'title']
+            ]
         ];
 
-        const {rate} = progressSettings;
+        let storeCount = 0;
+        for (const targets of targetGroups) {
+            storeCount += targets.length;
+        }
+
         const progressData = {
             count: 0,
             processed: 0,
-            storeCount: targets.length,
+            storeCount,
             storesProcesed: 0
         };
 
@@ -167,18 +182,20 @@ class DictionaryDatabase {
         const onProgress2 = () => {
             const processed = progressData.processed + 1;
             progressData.processed = processed;
-            if ((processed % rate) === 0 || processed === progressData.count) {
+            if ((processed % progressRate) === 0 || processed === progressData.count) {
                 onProgress(progressData);
             }
         };
 
-        const promises = [];
-        for (const [objectStoreName, indexName] of targets) {
-            const query = IDBKeyRange.only(dictionaryName);
-            const promise = this._db.bulkDelete(objectStoreName, indexName, query, filterKeys, onProgress2);
-            promises.push(promise);
+        for (const targets of targetGroups) {
+            const promises = [];
+            for (const [objectStoreName, indexName] of targets) {
+                const query = IDBKeyRange.only(dictionaryName);
+                const promise = this._db.bulkDelete(objectStoreName, indexName, query, filterKeys, onProgress2);
+                promises.push(promise);
+            }
+            await Promise.all(promises);
         }
-        await Promise.all(promises);
     }
 
     findTermsBulk(termList, dictionaries, wildcard) {
diff --git a/ext/js/language/dictionary-worker-handler.js b/ext/js/language/dictionary-worker-handler.js
index 3ce744f9..8aa6a265 100644
--- a/ext/js/language/dictionary-worker-handler.js
+++ b/ext/js/language/dictionary-worker-handler.js
@@ -84,7 +84,7 @@ class DictionaryWorkerHandler {
     async _deleteDictionary({dictionaryTitle}, onProgress) {
         const dictionaryDatabase = await this._getPreparedDictionaryDatabase();
         try {
-            return await dictionaryDatabase.deleteDictionary(dictionaryTitle, {rate: 1000}, onProgress);
+            return await dictionaryDatabase.deleteDictionary(dictionaryTitle, 1000, onProgress);
         } finally {
             dictionaryDatabase.close();
         }
diff --git a/test/test-database.js b/test/test-database.js
index e855f07f..a87a3f72 100644
--- a/test/test-database.js
+++ b/test/test-database.js
@@ -122,7 +122,7 @@ async function testDatabase1() {
                 let progressEvent = false;
                 await dictionaryDatabase.deleteDictionary(
                     title,
-                    {rate: 1000},
+                    1000,
                     () => {
                         progressEvent = true;
                     }
@@ -788,7 +788,7 @@ async function testDatabase2() {
     const dictionaryDatabase = new DictionaryDatabase();
 
     // Error: not prepared
-    await assert.rejects(async () => await dictionaryDatabase.deleteDictionary(title, {rate: 1000}, () => {}));
+    await assert.rejects(async () => await dictionaryDatabase.deleteDictionary(title, 1000));
     await assert.rejects(async () => await dictionaryDatabase.findTermsBulk(['?'], titles, null));
     await assert.rejects(async () => await dictionaryDatabase.findTermsExactBulk([{term: '?', reading: '?'}], titles));
     await assert.rejects(async () => await dictionaryDatabase.findTermsBySequenceBulk([{query: 1, dictionary: title}]));