diff --git a/.gitignore b/.gitignore
index 3941db60cc..459af2b711 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,5 @@ dictionaries/
 ext/manifest.json
 
 ext/lib/*
-!ext/lib/__mocks__/
 
 ext/legal-npm.html
diff --git a/dev/translator-vm.js b/dev/translator-vm.js
index 7fdda879eb..60777da05c 100644
--- a/dev/translator-vm.js
+++ b/dev/translator-vm.js
@@ -28,7 +28,7 @@ import {JapaneseUtil} from '../ext/js/language/sandbox/japanese-util.js';
 import {Translator} from '../ext/js/language/translator.js';
 import {createDictionaryArchive} from './util.js';
 
-vi.mock('../ext/js/language/dictionary-importer-media-loader.js');
+vi.mock('../ext/js/language/dictionary-importer-media-loader.js', async () => await import('../test/mocks/dictionary-importer-media-loader.js'));
 
 const dirname = path.dirname(fileURLToPath(import.meta.url));
 
diff --git a/ext/js/background/backend.js b/ext/js/background/backend.js
index 749c81a6b6..20c7a189da 100644
--- a/ext/js/background/backend.js
+++ b/ext/js/background/backend.js
@@ -2635,7 +2635,10 @@ export class Backend {
      */
     _getTranslatorFindKanjiOptions(options) {
         const enabledDictionaryMap = this._getTranslatorEnabledDictionaryMap(options);
-        return {enabledDictionaryMap};
+        return {
+            enabledDictionaryMap,
+            removeNonJapaneseCharacters: !options.scanning.alphanumeric
+        };
     }
 
     /**
diff --git a/ext/js/language/translator.js b/ext/js/language/translator.js
index aa1b71dd57..e33ea4d451 100644
--- a/ext/js/language/translator.js
+++ b/ext/js/language/translator.js
@@ -125,6 +125,9 @@ export class Translator {
      * @returns {Promise<import('dictionary').KanjiDictionaryEntry[]>} An array of definitions. See the _createKanjiDefinition() function for structure details.
      */
     async findKanji(text, options) {
+        if (options.removeNonJapaneseCharacters) {
+            text = this._getJapaneseOnlyText(text);
+        }
         const {enabledDictionaryMap} = options;
         const kanjiUnique = new Set();
         for (const c of text) {
diff --git a/test/anki-note-builder.test.js b/test/anki-note-builder.test.js
index 6901dde9b8..42ee22909c 100644
--- a/test/anki-note-builder.test.js
+++ b/test/anki-note-builder.test.js
@@ -53,7 +53,7 @@ async function fetch(url2) {
     };
 }
 vi.stubGlobal('fetch', fetch);
-vi.mock('../ext/js/templates/template-renderer-proxy.js');
+vi.mock('../ext/js/templates/template-renderer-proxy.js', async () => await import('../test/mocks/template-renderer-proxy.js'));
 
 /**
  * @returns {Promise<TranslatorVM>}
diff --git a/test/data/translator-test-inputs.json b/test/data/translator-test-inputs.json
index f6b5ea675d..cf4b8f6a6e 100644
--- a/test/data/translator-test-inputs.json
+++ b/test/data/translator-test-inputs.json
@@ -9,7 +9,8 @@
                         "priority": 0
                     }
                 ]
-            ]
+            ],
+            "removeNonJapaneseCharacters": false
         },
         "default": {
             "matchType": "exact",
diff --git a/test/database.test.js b/test/database.test.js
index e7774d95b2..2fdea99c31 100644
--- a/test/database.test.js
+++ b/test/database.test.js
@@ -22,15 +22,13 @@ import path from 'path';
 import {beforeEach, describe, expect, test, vi} from 'vitest';
 import {createDictionaryArchive} from '../dev/util.js';
 import {DictionaryDatabase} from '../ext/js/language/dictionary-database.js';
-import {DictionaryImporterMediaLoader} from '../ext/js/language/dictionary-importer-media-loader.js';
 import {DictionaryImporter} from '../ext/js/language/dictionary-importer.js';
+import {DictionaryImporterMediaLoader} from './mocks/dictionary-importer-media-loader.js';
 
 const dirname = path.dirname(fileURLToPath(import.meta.url));
 
 vi.stubGlobal('IDBKeyRange', IDBKeyRange);
 
-vi.mock('../ext/js/language/dictionary-importer-media-loader.js');
-
 /**
  * @param {string} dictionary
  * @param {string} [dictionaryName]
diff --git a/ext/js/language/__mocks__/dictionary-importer-media-loader.js b/test/mocks/dictionary-importer-media-loader.js
similarity index 100%
rename from ext/js/language/__mocks__/dictionary-importer-media-loader.js
rename to test/mocks/dictionary-importer-media-loader.js
diff --git a/ext/js/templates/__mocks__/template-renderer-proxy.js b/test/mocks/template-renderer-proxy.js
similarity index 95%
rename from ext/js/templates/__mocks__/template-renderer-proxy.js
rename to test/mocks/template-renderer-proxy.js
index 8823e8f3c2..106cdb35ec 100644
--- a/ext/js/templates/__mocks__/template-renderer-proxy.js
+++ b/test/mocks/template-renderer-proxy.js
@@ -16,7 +16,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-import {AnkiTemplateRenderer} from '../sandbox/anki-template-renderer.js';
+import {AnkiTemplateRenderer} from '../../ext/js/templates/sandbox/anki-template-renderer.js';
 
 export class TemplateRendererProxy {
     constructor() {
diff --git a/types/ext/translation.d.ts b/types/ext/translation.d.ts
index 3c41c9f367..3adfc6731f 100644
--- a/types/ext/translation.d.ts
+++ b/types/ext/translation.d.ts
@@ -29,6 +29,10 @@ export type FindKanjiOptions = {
      * The key is the dictionary name.
      */
     enabledDictionaryMap: Map<string, FindKanjiDictionary>;
+    /**
+     * Whether or not non-Japanese characters should be searched.
+     */
+    removeNonJapaneseCharacters: boolean;
 };
 
 /**