diff --git a/ext/bg/js/search-query-parser.js b/ext/bg/js/search-query-parser.js
index 6e18073b..4a4fcdde 100644
--- a/ext/bg/js/search-query-parser.js
+++ b/ext/bg/js/search-query-parser.js
@@ -27,9 +27,12 @@
  */
 
 class QueryParser extends TextScanner {
-    constructor(search) {
+    constructor({getOptionsContext, setContent, setSpinnerVisible}) {
         super(document.querySelector('#query-parser-content'), [], []);
-        this.search = search;
+
+        this.getOptionsContext = getOptionsContext;
+        this.setContent = setContent;
+        this.setSpinnerVisible = setSpinnerVisible;
 
         this.parseResults = [];
 
@@ -55,18 +58,18 @@ class QueryParser extends TextScanner {
     async onSearchSource(textSource, cause) {
         if (textSource === null) { return null; }
 
-        this.setTextSourceScanLength(textSource, this.search.options.scanning.length);
+        this.setTextSourceScanLength(textSource, this.options.scanning.length);
         const searchText = textSource.text();
         if (searchText.length === 0) { return; }
 
-        const {definitions, length} = await apiTermsFind(searchText, {}, this.search.getOptionsContext());
+        const {definitions, length} = await apiTermsFind(searchText, {}, this.getOptionsContext());
         if (definitions.length === 0) { return null; }
 
-        const sentence = docSentenceExtract(textSource, this.search.options.anki.sentenceExt);
+        const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
 
         textSource.setEndOffset(length);
 
-        this.search.setContent('terms', {definitions, context: {
+        this.setContent('terms', {definitions, context: {
             focus: false,
             disableHistory: cause === 'mouse',
             sentence,
@@ -78,7 +81,7 @@ class QueryParser extends TextScanner {
 
     onParserChange(e) {
         const selectedParser = e.target.value;
-        apiOptionsSet({parsing: {selectedParser}}, this.search.getOptionsContext());
+        apiOptionsSet({parsing: {selectedParser}}, this.getOptionsContext());
     }
 
     getMouseEventListeners() {
@@ -107,11 +110,23 @@ class QueryParser extends TextScanner {
         this.queryParser.dataset.termSpacing = `${options.parsing.termSpacing}`;
     }
 
+    getOptionsContext() {
+        throw new Error('Override me');
+    }
+
+    setContent(_type, _details) {
+        throw new Error('Override me');
+    }
+
+    setSpinnerVisible(_visible) {
+        throw new Error('Override me');
+    }
+
     refreshSelectedParser() {
         if (this.parseResults.length > 0) {
             if (!this.getParseResult()) {
                 const selectedParser = this.parseResults[0].id;
-                apiOptionsSet({parsing: {selectedParser}}, this.search.getOptionsContext());
+                apiOptionsSet({parsing: {selectedParser}}, this.getOptionsContext());
             }
         }
     }
@@ -122,7 +137,7 @@ class QueryParser extends TextScanner {
     }
 
     async setText(text) {
-        this.search.setSpinnerVisible(true);
+        this.setSpinnerVisible(true);
 
         this.setPreview(text);
 
@@ -132,20 +147,20 @@ class QueryParser extends TextScanner {
         this.renderParserSelect();
         this.renderParseResult();
 
-        this.search.setSpinnerVisible(false);
+        this.setSpinnerVisible(false);
     }
 
     async parseText(text) {
         const results = [];
-        if (this.search.options.parsing.enableScanningParser) {
+        if (this.options.parsing.enableScanningParser) {
             results.push({
                 name: 'Scanning parser',
                 id: 'scan',
-                parsedText: await apiTextParse(text, this.search.getOptionsContext())
+                parsedText: await apiTextParse(text, this.getOptionsContext())
             });
         }
-        if (this.search.options.parsing.enableMecabParser) {
-            const mecabResults = await apiTextParseMecab(text, this.search.getOptionsContext());
+        if (this.options.parsing.enableMecabParser) {
+            const mecabResults = await apiTextParseMecab(text, this.getOptionsContext());
             for (const [mecabDictName, mecabDictResults] of mecabResults) {
                 results.push({
                     name: `MeCab: ${mecabDictName}`,
diff --git a/ext/bg/js/search.js b/ext/bg/js/search.js
index 8b8ee55e..9250fdde 100644
--- a/ext/bg/js/search.js
+++ b/ext/bg/js/search.js
@@ -29,12 +29,18 @@ class DisplaySearch extends Display {
     constructor() {
         super(document.querySelector('#spinner'), document.querySelector('#content'));
 
+        this._isPrepared = false;
+
         this.optionsContext = {
             depth: 0,
             url: window.location.href
         };
 
-        this.queryParser = new QueryParser(this);
+        this.queryParser = new QueryParser({
+            getOptionsContext: this.getOptionsContext.bind(this),
+            setContent: this.setContent.bind(this),
+            setSpinnerVisible: this.setSpinnerVisible.bind(this)
+        });
 
         this.search = document.querySelector('#search');
         this.query = document.querySelector('#query');
@@ -112,6 +118,8 @@ class DisplaySearch extends Display {
             this.clipboardMonitor.on('change', this.onExternalSearchUpdate.bind(this));
 
             this.updateSearchButton();
+
+            this._isPrepared = true;
         } catch (e) {
             this.onError(e);
         }
@@ -278,6 +286,7 @@ class DisplaySearch extends Display {
     async updateOptions() {
         await super.updateOptions();
         this.queryParser.setOptions(this.options);
+        if (!this._isPrepared) { return; }
         const query = this.query.value;
         if (query) {
             this.setQuery(query);