diff --git a/ext/bg/js/query-parser.js b/ext/bg/js/query-parser.js
index 2ad88601..b0ef2d78 100644
--- a/ext/bg/js/query-parser.js
+++ b/ext/bg/js/query-parser.js
@@ -27,9 +27,6 @@ class QueryParser extends EventDispatcher {
         this._getOptionsContext = getOptionsContext;
         this._setSpinnerVisible = setSpinnerVisible;
         this._selectedParser = null;
-        this._scanLength = 1;
-        this._sentenceExtent = 1;
-        this._layoutAwareScan = false;
         this._documentUtil = documentUtil;
         this._parseResults = [];
         this._queryParser = document.querySelector('#query-parser-content');
@@ -50,19 +47,10 @@ class QueryParser extends EventDispatcher {
         this._queryParser.addEventListener('click', this._onClick.bind(this));
     }
 
-    setOptions({selectedParser, scanLength, sentenceExtent, layoutAwareScan, termSpacing, scanning}) {
+    setOptions({selectedParser, termSpacing, scanning}) {
         if (selectedParser === null || typeof selectedParser === 'string') {
             this._selectedParser = selectedParser;
         }
-        if (typeof scanLength === 'number') {
-            this._scanLength = scanLength;
-        }
-        if (typeof sentenceExtent === 'number') {
-            this._sentenceExtent = sentenceExtent;
-        }
-        if (typeof layoutAwareScan === 'boolean') {
-            this._layoutAwareScan = layoutAwareScan;
-        }
         if (typeof termSpacing === 'boolean') {
             this._queryParser.dataset.termSpacing = `${termSpacing}`;
         }
@@ -95,22 +83,14 @@ class QueryParser extends EventDispatcher {
     async _search(textSource, cause) {
         if (textSource === null) { return null; }
 
-        const scanLength = this._scanLength;
-        const sentenceExtent = this._sentenceExtent;
-        const layoutAwareScan = this._layoutAwareScan;
-        const searchText = this._textScanner.getTextSourceContent(textSource, scanLength, layoutAwareScan);
-        if (searchText.length === 0) { return null; }
-
         const optionsContext = this._getOptionsContext();
-        const {definitions, length} = await api.termsFind(searchText, {}, optionsContext);
-        if (definitions.length === 0) { return null; }
+        const results = await this._textScanner.findTerms(textSource, optionsContext);
+        if (results === null) { return null; }
 
-        const sentence = this._documentUtil.extractSentence(textSource, sentenceExtent, layoutAwareScan);
-
-        textSource.setEndOffset(length, layoutAwareScan);
+        const {definitions, sentence, type} = results;
 
         this.trigger('searched', {
-            type: 'terms',
+            type,
             definitions,
             sentence,
             cause,
@@ -118,7 +98,7 @@ class QueryParser extends EventDispatcher {
             optionsContext
         });
 
-        return {definitions, type: 'terms'};
+        return {definitions, type};
     }
 
     _onParserChange(e) {
diff --git a/ext/fg/js/frontend.js b/ext/fg/js/frontend.js
index 9e3b902f..981852db 100644
--- a/ext/fg/js/frontend.js
+++ b/ext/fg/js/frontend.js
@@ -253,7 +253,10 @@ class Frontend {
             modifier: scanningOptions.modifier,
             useMiddleMouse: scanningOptions.middleMouse,
             delay: scanningOptions.delay,
-            touchInputEnabled: scanningOptions.touchInputEnabled
+            touchInputEnabled: scanningOptions.touchInputEnabled,
+            scanLength: scanningOptions.length,
+            sentenceExtent: options.anki.sentenceExt,
+            layoutAwareScan: scanningOptions.layoutAwareScan
         });
         this._updateTextScannerEnabled();
 
@@ -399,8 +402,8 @@ class Frontend {
             if (textSource !== null) {
                 const optionsContext = await this.getOptionsContext();
                 results = (
-                    await this._findTerms(textSource, optionsContext) ||
-                    await this._findKanji(textSource, optionsContext)
+                    await this._textScanner.findTerms(textSource, optionsContext) ||
+                    await this._textScanner.findKanji(textSource, optionsContext)
                 );
                 if (results !== null) {
                     const focus = (cause === 'mouse');
@@ -424,32 +427,6 @@ class Frontend {
         return results;
     }
 
-    async _findTerms(textSource, optionsContext) {
-        const {length: scanLength, layoutAwareScan} = this._options.scanning;
-        const searchText = this._textScanner.getTextSourceContent(textSource, scanLength, layoutAwareScan);
-        if (searchText.length === 0) { return null; }
-
-        const {definitions, length} = await api.termsFind(searchText, {}, optionsContext);
-        if (definitions.length === 0) { return null; }
-
-        textSource.setEndOffset(length, layoutAwareScan);
-
-        return {definitions, type: 'terms'};
-    }
-
-    async _findKanji(textSource, optionsContext) {
-        const layoutAwareScan = this._options.scanning.layoutAwareScan;
-        const searchText = this._textScanner.getTextSourceContent(textSource, 1, layoutAwareScan);
-        if (searchText.length === 0) { return null; }
-
-        const definitions = await api.kanjiFind(searchText, optionsContext);
-        if (definitions.length === 0) { return null; }
-
-        textSource.setEndOffset(1, layoutAwareScan);
-
-        return {definitions, type: 'kanji'};
-    }
-
     async _showExtensionUnloaded(textSource) {
         if (textSource === null) {
             textSource = this._textScanner.getCurrentTextSource();
diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index 1cc08bc7..3f8a43ab 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -228,9 +228,6 @@ class Display extends EventDispatcher {
 
         this._queryParser.setOptions({
             selectedParser: options.parsing.selectedParser,
-            scanLength: scanning.length,
-            sentenceExtent: options.anki.sentenceExt,
-            layoutAwareScan: scanning.layoutAwareScan,
             termSpacing: options.parsing.termSpacing,
             scanning: {
                 deepContentScan: scanning.deepDomScan,
@@ -238,7 +235,10 @@ class Display extends EventDispatcher {
                 modifier: scanning.modifier,
                 useMiddleMouse: scanning.middleMouse,
                 delay: scanning.delay,
-                touchInputEnabled: scanning.touchInputEnabled
+                touchInputEnabled: scanning.touchInputEnabled,
+                scanLength: scanning.length,
+                sentenceExtent: options.anki.sentenceExt,
+                layoutAwareScan: scanning.layoutAwareScan
             }
         });
     }
diff --git a/ext/mixed/js/text-scanner.js b/ext/mixed/js/text-scanner.js
index d0256b1e..5a64c14a 100644
--- a/ext/mixed/js/text-scanner.js
+++ b/ext/mixed/js/text-scanner.js
@@ -17,6 +17,7 @@
 
 /* global
  * DocumentUtil
+ * api
  */
 
 class TextScanner extends EventDispatcher {
@@ -43,6 +44,9 @@ class TextScanner extends EventDispatcher {
         this._useMiddleMouse = false;
         this._delay = 0;
         this._touchInputEnabled = false;
+        this._scanLength = 1;
+        this._sentenceExtent = 1;
+        this._layoutAwareScan = false;
 
         this._enabled = false;
         this._eventListeners = new EventListenerCollection();
@@ -91,7 +95,7 @@ class TextScanner extends EventDispatcher {
         }
     }
 
-    setOptions({deepContentScan, selectText, modifier, useMiddleMouse, delay, touchInputEnabled}) {
+    setOptions({deepContentScan, selectText, modifier, useMiddleMouse, delay, touchInputEnabled, scanLength, sentenceExtent, layoutAwareScan}) {
         if (typeof deepContentScan === 'boolean') {
             this._deepContentScan = deepContentScan;
         }
@@ -110,6 +114,15 @@ class TextScanner extends EventDispatcher {
         if (typeof touchInputEnabled === 'boolean') {
             this._touchInputEnabled = false;
         }
+        if (typeof scanLength === 'number') {
+            this._scanLength = scanLength;
+        }
+        if (typeof sentenceExtent === 'number') {
+            this._sentenceExtent = sentenceExtent;
+        }
+        if (typeof layoutAwareScan === 'boolean') {
+            this._layoutAwareScan = layoutAwareScan;
+        }
     }
 
     async searchAt(x, y, cause) {
@@ -193,6 +206,37 @@ class TextScanner extends EventDispatcher {
         }
     }
 
+    async findTerms(textSource, optionsContext) {
+        const scanLength = this._scanLength;
+        const sentenceExtent = this._sentenceExtent;
+        const layoutAwareScan = this._layoutAwareScan;
+        const searchText = this.getTextSourceContent(textSource, scanLength, layoutAwareScan);
+        if (searchText.length === 0) { return null; }
+
+        const {definitions, length} = await api.termsFind(searchText, {}, optionsContext);
+        if (definitions.length === 0) { return null; }
+
+        textSource.setEndOffset(length, layoutAwareScan);
+        const sentence = this._documentUtil.extractSentence(textSource, sentenceExtent, layoutAwareScan);
+
+        return {definitions, sentence, type: 'terms'};
+    }
+
+    async findKanji(textSource, optionsContext) {
+        const sentenceExtent = this._sentenceExtent;
+        const layoutAwareScan = this._layoutAwareScan;
+        const searchText = this.getTextSourceContent(textSource, 1, layoutAwareScan);
+        if (searchText.length === 0) { return null; }
+
+        const definitions = await api.kanjiFind(searchText, optionsContext);
+        if (definitions.length === 0) { return null; }
+
+        textSource.setEndOffset(1, layoutAwareScan);
+        const sentence = this._documentUtil.extractSentence(textSource, sentenceExtent, layoutAwareScan);
+
+        return {definitions, sentence, type: 'kanji'};
+    }
+
     // Private
 
     _onMouseOver(e) {