diff --git a/chrome/content/zotero/xpcom/file.js b/chrome/content/zotero/xpcom/file.js
index 18b23b3a68..42d816fff8 100644
--- a/chrome/content/zotero/xpcom/file.js
+++ b/chrome/content/zotero/xpcom/file.js
@@ -398,11 +398,11 @@ Zotero.File = new function(){
 	 * Write data to a file asynchronously
 	 *
 	 * @param {String|nsIFile} - String path or nsIFile to write to
-	 * @param {String|nsIInputStream} data - The string or nsIInputStream to write to the file
+	 * @param {String|nsIInputStream|ArrayBuffer} data - The data to write to the file
 	 * @param {String} [charset] - The character set; defaults to UTF-8
 	 * @return {Promise} - A promise that is resolved when the file has been written
 	 */
-	this.putContentsAsync = function (path, data, charset) {
+	this.putContentsAsync = async function (path, data, charset) {
 		if (path instanceof Ci.nsIFile) {
 			path = path.path;
 		}
@@ -418,16 +418,33 @@ Zotero.File = new function(){
 			));
 		}
 		
-		var deferred = Zotero.Promise.defer();
-		var os = FileUtils.openSafeFileOutputStream(new FileUtils.File(path));
-		NetUtil.asyncCopy(data, os, function(inputStream, status) {
-			if (!Components.isSuccessCode(status)) {
-				deferred.reject(new Components.Exception("File write operation failed", status));
-				return;
-			}
-			deferred.resolve();
+		// If Blob, feed that to an input stream
+		//
+		// data instanceof Blob doesn't work in XPCOM
+		if (typeof data.size != 'undefined' && typeof data.slice == 'function') {
+			let arrayBuffer = await new Zotero.Promise(function (resolve) {
+				let fr = new FileReader();
+				fr.addEventListener("loadend", function() {
+					resolve(fr.result);
+				});
+				fr.readAsArrayBuffer(data);
+			});
+			let is = Components.classes["@mozilla.org/io/arraybuffer-input-stream;1"]
+				.createInstance(Components.interfaces.nsIArrayBufferInputStream);
+			is.setData(arrayBuffer, 0, arrayBuffer.byteLength);
+			data = is;
+		}
+		
+		await new Zotero.Promise(function (resolve, reject) {
+			var os = FileUtils.openSafeFileOutputStream(new FileUtils.File(path));
+			NetUtil.asyncCopy(data, os, function(inputStream, status) {
+				if (!Components.isSuccessCode(status)) {
+					reject(new Components.Exception("File write operation failed", status));
+					return;
+				}
+				resolve();
+			});
 		});
-		return deferred.promise;
 	};
 	
 	
diff --git a/chrome/content/zotero/xpcom/translation/translators.js b/chrome/content/zotero/xpcom/translation/translators.js
index 3936466127..7b50cce6f9 100644
--- a/chrome/content/zotero/xpcom/translation/translators.js
+++ b/chrome/content/zotero/xpcom/translation/translators.js
@@ -519,7 +519,7 @@ Zotero.Translators = new function() {
 		
 		Zotero.debug("Saving translator '" + metadata.label + "'");
 		Zotero.debug(metadata);
-		return Zotero.File.putContentsAsync(destFile, str).return(destFile);
+		return Zotero.File.putContentsAsync(destFile, str).then(() => destFile);
 	});
 	
 	this.cacheInDB = function(fileName, metadataJSON, lastModifiedTime) {
diff --git a/test/tests/fileTest.js b/test/tests/fileTest.js
index 224d83afc7..ad05a17c1a 100644
--- a/test/tests/fileTest.js
+++ b/test/tests/fileTest.js
@@ -83,6 +83,31 @@ describe("Zotero.File", function () {
 	});
 	
 	describe("#putContentsAsync()", function () {
+		it("should save a text string", async function () {
+			var tmpDir = await getTempDirectory();
+			var destFile = OS.Path.join(tmpDir, 'test');
+			var str = 'A';
+			await Zotero.File.putContentsAsync(destFile, str);
+			assert.equal(await Zotero.File.getContentsAsync(destFile), str);
+		});
+		
+		it("should save a Blob", async function () {
+			var srcFile = OS.Path.join(getTestDataDirectory().path, 'test.pdf');
+			var tmpDir = await getTempDirectory();
+			var destFile = OS.Path.join(tmpDir, 'test.pdf');
+			
+			var blob = await File.createFromFileName(srcFile);
+			await Zotero.File.putContentsAsync(destFile, blob);
+			
+			var destContents = await Zotero.File.getBinaryContentsAsync(destFile);
+			assert.equal(
+				await Zotero.File.getBinaryContentsAsync(srcFile),
+				destContents
+			);
+			
+			assert.equal(destContents.substr(0, 4), '%PDF');
+		});
+		
 		it("should save via .tmp file", function* () {
 			var tmpDir = yield getTempDirectory();
 			var destFile = OS.Path.join(tmpDir, 'test.txt')
@@ -91,7 +116,7 @@ describe("Zotero.File", function () {
 			assert.isTrue(yield OS.File.exists(tmpFile));
 			yield Zotero.File.putContentsAsync(destFile, 'B');
 			assert.isFalse(yield OS.File.exists(tmpFile));
-			// Make sure .tmp file created when creating temp file was deleted too
+			// Make sure .tmp file was deleted
 			assert.isFalse(yield OS.File.exists(tmpFile + '.tmp'));
 		});
 	});