diff --git a/ext/bg/js/yomichan.js b/ext/bg/js/yomichan.js
index bf277a2f..6aca4b5d 100644
--- a/ext/bg/js/yomichan.js
+++ b/ext/bg/js/yomichan.js
@@ -171,7 +171,9 @@ class Yomichan {
             'kunyomi',
             'onyomi',
             'reading',
+            'sentence',
             'tags',
+            'url',
         ];
 
         for (let tag of tags) {
diff --git a/ext/fg/js/client.js b/ext/fg/js/client.js
index 2c46e9cf..a8fbaa68 100644
--- a/ext/fg/js/client.js
+++ b/ext/fg/js/client.js
@@ -19,17 +19,18 @@
 
 class Client {
     constructor() {
-        this.popup          = new Popup();
-        this.audio          = {};
-        this.lastMousePos   = null;
+        this.popup = new Popup();
+        this.audio = {};
+        this.lastMousePos = null;
         this.lastTextSource = null;
-        this.activateKey    = 16;
-        this.activateBtn    = 2;
-        this.enabled        = false;
-        this.options        = {};
-        this.definitions    = null;
-        this.sequence       = 0;
-        this.fgRoot         = chrome.extension.getURL('fg');
+        this.activateKey = 16;
+        this.activateBtn = 2;
+        this.sentenceExtent = 200;
+        this.enabled = false;
+        this.options = {};
+        this.definitions = null;
+        this.sequence = 0;
+        this.fgRoot = chrome.extension.getURL('fg');
 
         chrome.runtime.onMessage.addListener(this.onBgMessage.bind(this));
         window.addEventListener('message', this.onFrameMessage.bind(this));
@@ -94,9 +95,15 @@ class Client {
             if (length === 0) {
                 this.hidePopup();
             } else {
-                const sequence = ++this.sequence;
                 textSource.setEndOffset(length);
 
+                const sentence = Client.extractSentence(textSource, this.sentenceExtent);
+                definitions.forEach((definition) => {
+                    definition.url = window.location.href;
+                    definition.sentence = sentence;
+                });
+
+                const sequence = ++this.sequence;
                 bgRenderText(
                     {definitions, root: this.fgRoot, options: this.options, sequence},
                     'term-list.html',
@@ -180,6 +187,10 @@ class Client {
 
     api_displayKanji(kanji) {
         bgFindKanji(kanji, (definitions) => {
+            definitions.forEach((definition) => {
+                definition.url = window.location.href;
+            });
+
             const sequence = ++this.sequence;
             bgRenderText(
                 {definitions, root: this.fgRoot, options: this.options, sequence},
@@ -219,11 +230,16 @@ class Client {
         return null;
     }
 
-    static extractSentence(content, position) {
-        const quotesFwd   = {'「': '」', '『': '』', "'": "'", '"': '"'};
-        const quotesBwd   = {'」': '「', '』': '『', "'": "'", '"': '"'};
+    static extractSentence(source, extent) {
+        const quotesFwd = {'「': '」', '『': '』', "'": "'", '"': '"'};
+        const quotesBwd = {'」': '「', '』': '『', "'": "'", '"': '"'};
         const terminators = '…。．.？?！!';
 
+        const sourceLocal = source.clone();
+        const position = sourceLocal.setStartOffset(extent);
+        sourceLocal.setEndOffset(position + extent);
+        const content = sourceLocal.text();
+
         let quoteStack = [];
 
         let startPos = 0;
diff --git a/ext/fg/js/source-input.js b/ext/fg/js/source-input.js
index 9f5a76a0..d3c92793 100644
--- a/ext/fg/js/source-input.js
+++ b/ext/fg/js/source-input.js
@@ -18,9 +18,13 @@
 
 
 class TextSourceInput {
-    constructor(input) {
+    constructor(input, length=-1) {
         this.input = input;
-        this.length = -1;
+        this.length = length;
+    }
+
+    clone() {
+        return new TextSourceInput(this.input, this.length);
     }
 
     text() {
diff --git a/ext/fg/js/source-range.js b/ext/fg/js/source-range.js
index fbab45f9..879b949c 100644
--- a/ext/fg/js/source-range.js
+++ b/ext/fg/js/source-range.js
@@ -22,20 +22,26 @@ class TextSourceRange {
         this.rng = range;
     }
 
+    clone() {
+        return new TextSourceRange(this.rng.cloneRange());
+    }
+
     text() {
         return this.rng.toString();
     }
 
     setEndOffset(length) {
-        const end = TextSourceRange.seekForward(this.rng.startContainer, this.rng.startOffset + length);
-        this.rng.setEnd(end.node, end.offset);
-        return length - end.length;
+        const lengthAdj = length + this.rng.startOffset;
+        const state = TextSourceRange.seekForward(this.rng.startContainer, lengthAdj);
+        this.rng.setEnd(state.node, state.offset);
+        return length - state.length;
     }
 
     setStartOffset(length) {
-        const start = TextSourceRange.seekBackward(this.rng.startContainer, length + (this.rng.startContainer.length - this.rng.startOffset));
-        this.rng.setStart(start.node, start.offset);
-        return length - start.length;
+        const lengthAdj = length + (this.rng.startContainer.length - this.rng.startOffset);
+        const state = TextSourceRange.seekBackward(this.rng.startContainer, lengthAdj);
+        this.rng.setStart(state.node, state.offset);
+        return length - state.length;
     }
 
     containsPoint(point) {
@@ -48,10 +54,10 @@ class TextSourceRange {
     }
 
     getPaddedRect() {
-        const range       = this.rng.cloneRange();
+        const range = this.rng.cloneRange();
         const startOffset = range.startOffset;
-        const endOffset   = range.endOffset;
-        const node        = range.startContainer;
+        const endOffset = range.endOffset;
+        const node = range.startContainer;
 
         range.setStart(node, Math.max(0, startOffset - 1));
         range.setEnd(node, Math.min(node.length, endOffset + 1));