diff --git a/ext/bg/data/options-schema.json b/ext/bg/data/options-schema.json
index 4f9e694d..8622f16b 100644
--- a/ext/bg/data/options-schema.json
+++ b/ext/bg/data/options-schema.json
@@ -492,6 +492,7 @@
                                     "screenshot",
                                     "terms",
                                     "kanji",
+                                    "duplicateScope",
                                     "fieldTemplates"
                                 ],
                                 "properties": {
@@ -587,6 +588,11 @@
                                             }
                                         }
                                     },
+                                    "duplicateScope": {
+                                        "type": "string",
+                                        "default": "collection",
+                                        "enum": ["collection", "deck"]
+                                    },
                                     "fieldTemplates": {
                                         "type": ["string", "null"],
                                         "default": null
diff --git a/ext/bg/js/anki-note-builder.js b/ext/bg/js/anki-note-builder.js
index 9bab095d..dc1e9427 100644
--- a/ext/bg/js/anki-note-builder.js
+++ b/ext/bg/js/anki-note-builder.js
@@ -32,7 +32,10 @@ class AnkiNoteBuilder {
             fields: {},
             tags,
             deckName: modeOptions.deck,
-            modelName: modeOptions.model
+            modelName: modeOptions.model,
+            options: {
+                duplicateScope: options.anki.duplicateScope
+            }
         };
 
         for (const [fieldName, fieldValue] of modeOptionsFieldEntries) {
diff --git a/ext/bg/js/anki.js b/ext/bg/js/anki.js
index 38823431..0d38837c 100644
--- a/ext/bg/js/anki.js
+++ b/ext/bg/js/anki.js
@@ -87,15 +87,14 @@ class AnkiConnect {
         return await this._invoke('storeMediaFile', {filename, data: dataBase64});
     }
 
-    async findNoteIds(notes) {
+    async findNoteIds(notes, duplicateScope) {
         if (!this._enabled) { return []; }
         await this._checkVersion();
-        const actions = notes.map((note) => ({
-            action: 'findNotes',
-            params: {
-                query: `deck:"${this._escapeQuery(note.deckName)}" ${this._fieldsToQuery(note.fields)}`
-            }
-        }));
+        const actions = notes.map((note) => {
+            let query = (duplicateScope === 'deck' ? `"deck:${this._escapeQuery(note.deckName)}" ` : '');
+            query += this._fieldsToQuery(note.fields);
+            return {action: 'findNotes', params: {query}};
+        });
         return await this._invoke('multi', {actions});
     }
 
@@ -132,6 +131,6 @@ class AnkiConnect {
         }
 
         const key = fieldNames[0];
-        return `${key.toLowerCase()}:"${this._escapeQuery(fields[key])}"`;
+        return `"${key.toLowerCase()}:${this._escapeQuery(fields[key])}"`;
     }
 }
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 3c47b14e..dd1fd8e9 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -555,7 +555,7 @@ class Backend {
             }
 
             if (cannotAdd.length > 0) {
-                const noteIdsArray = await this.anki.findNoteIds(cannotAdd.map((e) => e[0]));
+                const noteIdsArray = await this.anki.findNoteIds(cannotAdd.map((e) => e[0]), options.anki.duplicateScope);
                 for (let i = 0, ii = Math.min(cannotAdd.length, noteIdsArray.length); i < ii; ++i) {
                     const noteIds = noteIdsArray[i];
                     if (noteIds.length > 0) {
diff --git a/ext/bg/js/options.js b/ext/bg/js/options.js
index da26b628..8e1814ed 100644
--- a/ext/bg/js/options.js
+++ b/ext/bg/js/options.js
@@ -201,6 +201,7 @@ function profileOptionsCreateDefaults() {
             screenshot: {format: 'png', quality: 92},
             terms: {deck: '', model: '', fields: {}},
             kanji: {deck: '', model: '', fields: {}},
+            duplicateScope: 'collection',
             fieldTemplates: null
         }
     };
diff --git a/ext/bg/js/settings/main.js b/ext/bg/js/settings/main.js
index f03cc631..cf75d629 100644
--- a/ext/bg/js/settings/main.js
+++ b/ext/bg/js/settings/main.js
@@ -131,6 +131,7 @@ async function formRead(options) {
     options.anki.tags = utilBackgroundIsolate($('#card-tags').val().split(/[,; ]+/));
     options.anki.sentenceExt = parseInt($('#sentence-detection-extent').val(), 10);
     options.anki.server = $('#interface-server').val();
+    options.anki.duplicateScope = $('#duplicate-scope').val();
     options.anki.screenshot.format = $('#screenshot-format').val();
     options.anki.screenshot.quality = parseInt($('#screenshot-quality').val(), 10);
 
@@ -212,6 +213,7 @@ async function formWrite(options) {
     $('#card-tags').val(options.anki.tags.join(' '));
     $('#sentence-detection-extent').val(options.anki.sentenceExt);
     $('#interface-server').val(options.anki.server);
+    $('#duplicate-scope').val(options.anki.duplicateScope);
     $('#screenshot-format').val(options.anki.screenshot.format);
     $('#screenshot-quality').val(options.anki.screenshot.quality);
 
diff --git a/ext/bg/settings.html b/ext/bg/settings.html
index f0236193..b6120b5f 100644
--- a/ext/bg/settings.html
+++ b/ext/bg/settings.html
@@ -820,6 +820,14 @@
                         <input type="text" id="interface-server" class="form-control">
                     </div>
 
+                    <div class="form-group options-advanced">
+                        <label for="duplicate-scope">Duplicate scope</label>
+                        <select class="form-control" id="duplicate-scope">
+                            <option value="collection">Collection</option>
+                            <option value="deck">Deck</option>
+                        </select>
+                    </div>
+
                     <div class="form-group options-advanced">
                         <label for="screenshot-format">Screenshot format</label>
                         <select class="form-control" id="screenshot-format">