2 files changed, 29 insertions, 3 deletions

diff --git a/ext/js/data/options-util.js b/ext/js/data/options-util.js
index 4e468aea..62b062aa 100644
--- a/ext/js/data/options-util.js
+++ b/ext/js/data/options-util.js
@@ -536,7 +536,8 @@ export class OptionsUtil {
             this._updateVersion27,
             this._updateVersion28,
             this._updateVersion29,
-            this._updateVersion30
+            this._updateVersion30,
+            this._updateVersion31
         ];
         /* eslint-enable @typescript-eslint/unbound-method */
         if (typeof targetVersion === 'number' && targetVersion < result.length) {
@@ -1234,6 +1235,16 @@ export class OptionsUtil {
     }
 
     /**
+     *  - Added anki.duplicateBehavior
+     *  @type {import('options-util').UpdateFunction}
+     */
+    _updateVersion31(options) {
+        for (const {options: profileOptions} of options.profiles) {
+            profileOptions.anki.duplicateBehavior = 'new';
+        }
+    }
+
+    /**
      * @param {string} url
      * @returns {Promise<chrome.tabs.Tab>}
      */
diff --git a/ext/js/display/display-anki.js b/ext/js/display/display-anki.js
index 446b8b48..23f7157f 100644
--- a/ext/js/display/display-anki.js
+++ b/ext/js/display/display-anki.js
@@ -74,6 +74,8 @@ export class DisplayAnki {
         this._duplicateScope = 'collection';
         /** @type {boolean} */
         this._duplicateScopeCheckAllModels = false;
+        /** @type {import('settings').AnkiDuplicateBehavior} */
+        this._duplicateBehavior = 'prevent';
         /** @type {import('settings').AnkiScreenshotFormat} */
         this._screenshotFormat = 'png';
         /** @type {number} */
@@ -192,6 +194,7 @@ export class DisplayAnki {
                 tags,
                 duplicateScope,
                 duplicateScopeCheckAllModels,
+                duplicateBehavior,
                 suspendNewCards,
                 checkForDuplicates,
                 displayTags,
@@ -212,6 +215,7 @@ export class DisplayAnki {
         this._displayTags = displayTags;
         this._duplicateScope = duplicateScope;
         this._duplicateScopeCheckAllModels = duplicateScopeCheckAllModels;
+        this._duplicateBehavior = duplicateBehavior;
         this._screenshotFormat = format;
         this._screenshotQuality = quality;
         this._scanLength = scanLength;
@@ -419,7 +423,7 @@ export class DisplayAnki {
 
                     // If entry has noteIds, show the "add duplicate" button.
                     if (Array.isArray(noteIds) && noteIds.length > 0) {
-                        this._showDuplicateAddButton(button);
+                        this._updateButtonForDuplicate(button);
                     }
                 }
 
@@ -442,6 +446,17 @@ export class DisplayAnki {
     }
 
     /**
+     * @param {HTMLButtonElement} button
+     */
+    _updateButtonForDuplicate(button) {
+        if (this._duplicateBehavior === 'prevent') {
+            button.disabled = true;
+        } else {
+            this._showDuplicateAddButton(button);
+        }
+    }
+
+    /**
      * @param {number} i
      * @param {(?import('anki').NoteInfo)[]} noteInfos
      */
@@ -550,7 +565,7 @@ export class DisplayAnki {
                         }
                     }
                     // Now that this dictionary entry has a duplicate in Anki, show the "add duplicate" buttons.
-                    this._showDuplicateAddButton(button);
+                    this._updateButtonForDuplicate(button);
 
                     this._updateViewNoteButton(dictionaryEntryIndex, [noteId], true);
                 }