diff --git a/chrome/content/zotero/xpcom/sync/syncLocal.js b/chrome/content/zotero/xpcom/sync/syncLocal.js
index a8bbd905e..036c9c6d8 100644
--- a/chrome/content/zotero/xpcom/sync/syncLocal.js
+++ b/chrome/content/zotero/xpcom/sync/syncLocal.js
@@ -1547,6 +1547,15 @@ Zotero.Sync.Data.Local = {
 		}
 		
 		var localChanged = false;
+		var normalizeHTML = (str) => {
+			let parser = Components.classes["@mozilla.org/xmlextras/domparser;1"]
+				.createInstance(Components.interfaces.nsIDOMParser);
+			str = parser.parseFromString(str, 'text/html');
+			str = str.body.textContent;
+			// Normalize internal spaces
+			str = str.replace(/\s+/g, ' ');
+			return str;
+		};
 		
 		// Massage some old data
 		conflicts = conflicts.filter((x) => {
@@ -1567,6 +1576,27 @@ Zotero.Sync.Data.Local = {
 					}
 				}
 			}
+			// Ignore notes with the same text content
+			//
+			// These can happen to people upgrading to 5.0 with notes that were added without going
+			// through TinyMCE (e.g., from translators)
+			else if (x[0].field == 'note' && x[0].op == 'add' && x[1].op == 'add') {
+				let a = x[0].value;
+				let b = x[1].value;
+				try {
+					a = normalizeHTML(a);
+					b = normalizeHTML(b);
+					if (a == b) {
+						Zotero.debug("Notes differ only by markup -- using remote version");
+						changes.push(x[1]);
+						return false;
+					}
+				}
+				catch (e) {
+					Zotero.logError(e);
+					return true
+				}
+			}
 			return true;
 		});
 		
diff --git a/test/tests/syncLocalTest.js b/test/tests/syncLocalTest.js
index cfade8e6d..dbc0e4d40 100644
--- a/test/tests/syncLocalTest.js
+++ b/test/tests/syncLocalTest.js
@@ -1965,6 +1965,64 @@ describe("Zotero.Sync.Data.Local", function() {
 			);
 		})
 		
+		it("should automatically use remote version for note markup differences when text content matches", function () {
+			var val2 = "<p>Foo bar<br />bar   foo</p>";
+			
+			var json1 = {
+				key: "AAAAAAAA",
+				version: 0,
+				itemType: "note",
+				note: "Foo bar<br/>bar foo",
+				dateModified: "2017-06-13 13:45:12"
+			};
+			var json2 = {
+				key: "AAAAAAAA",
+				version: 5,
+				itemType: "note",
+				note: val2,
+				dateModified: "2017-06-13 13:45:12"
+			};
+			var ignoreFields = ['dateAdded', 'dateModified'];
+			var result = Zotero.Sync.Data.Local._reconcileChangesWithoutCache(
+				'item', json1, json2, ignoreFields
+			);
+			assert.lengthOf(result.changes, 1);
+			assert.sameDeepMembers(
+				result.changes,
+				[
+					{
+						field: "note",
+						op: "add",
+						value: val2
+					}
+				]
+			);
+			assert.lengthOf(result.conflicts, 0);
+		});
+		
+		it("should show conflict for note markup differences when text content doesn't match", function () {
+			var json1 = {
+				key: "AAAAAAAA",
+				version: 0,
+				itemType: "note",
+				note: "Foo bar?",
+				dateModified: "2017-06-13 13:45:12"
+			};
+			var json2 = {
+				key: "AAAAAAAA",
+				version: 5,
+				itemType: "note",
+				note: "<p>Foo bar!</p>",
+				dateModified: "2017-06-13 13:45:12"
+			};
+			var ignoreFields = ['dateAdded', 'dateModified'];
+			var result = Zotero.Sync.Data.Local._reconcileChangesWithoutCache(
+				'item', json1, json2, ignoreFields
+			);
+			assert.lengthOf(result.changes, 0);
+			assert.lengthOf(result.conflicts, 1);
+		});
+		
 		it("should automatically use remote version for conflicting fields when both sides are in trash", function () {
 			var json1 = {
 				key: "AAAAAAAA",