diff --git a/ext/bg/js/api.js b/ext/bg/js/api.js
index 9dbb69c1..bc2693e5 100644
--- a/ext/bg/js/api.js
+++ b/ext/bg/js/api.js
@@ -35,7 +35,7 @@ async function apiOptionsSet(options) {
     // to the DOM across to the background page, causing the options object to
     // become a "DeadObject" after the options page is closed. The workaround used
     // here is to create a deep copy of the options object.
-    backend().optionsSet(JSON.parse(JSON.stringify(options)));
+    backend().onOptionsUpdated(JSON.parse(JSON.stringify(options)));
 }
 
 async function apiOptionsGet() {
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 6b345e6d..1c058433 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -36,7 +36,7 @@ window.yomichan_backend = new class {
         }
     }
 
-    optionsSet(options) {
+    onOptionsUpdated(options) {
         this.options = options;
 
         if (!options.general.enable) {
diff --git a/ext/bg/js/display-window.js b/ext/bg/js/display-window.js
index 1f607510..52c0cafa 100644
--- a/ext/bg/js/display-window.js
+++ b/ext/bg/js/display-window.js
@@ -21,12 +21,11 @@ window.displayWindow = new class extends Display {
     constructor() {
         super($('#spinner'), $('#content'));
 
-        const search = $('#search');
-        search.click(this.onSearch.bind(this));
+        this.search = $('#search').click(this.onSearch.bind(this));
+        this.query = $('#query').on('input', this.inputSearch.bind(this));
+        this.intro = $('#intro');
 
-        const query = $('#query');
-        query.on('input', () => search.prop('disabled', query.val().length === 0));
-        window.wanakana.bind(query.get(0));
+        window.wanakana.bind(this.query.get(0));
     }
 
     handleError(error) {
@@ -34,15 +33,19 @@ window.displayWindow = new class extends Display {
     }
 
     clearSearch() {
-        $('#query').focus().select();
+        this.query.focus().select();
+    }
+
+    inputSearch() {
+        this.search.prop('disabled', this.query.val().length === 0);
     }
 
     async onSearch(e) {
         e.preventDefault();
 
         try {
-            $('#intro').slideUp();
-            const {length, definitions} = await apiTermsFind($('#query').val());
+            this.intro.slideUp();
+            const {length, definitions} = await apiTermsFind(this.query.val());
             super.showTermDefs(definitions, await apiOptionsGet());
         } catch (e) {
             this.handleError(e);