diff --git a/chrome/content/zotero/preferences/preferences_general.js b/chrome/content/zotero/preferences/preferences_general.js
index cee4c83369..c2272c1b9b 100644
--- a/chrome/content/zotero/preferences/preferences_general.js
+++ b/chrome/content/zotero/preferences/preferences_general.js
@@ -41,6 +41,10 @@ Zotero_Preferences.General = {
 		var menuitem = document.getElementById('fileHandler-internal');
 		menuitem.setAttribute('label', Zotero.appName);
 		
+		if (Zotero.isPDFBuild) {
+			document.getElementById('useInternalPDFReader-checkbox').hidden = false;
+		}
+		
 		this.updateAutoRenameFilesUI();
 		this._updateFileHandlerUI();
 	},
diff --git a/chrome/content/zotero/preferences/preferences_general.xul b/chrome/content/zotero/preferences/preferences_general.xul
index 65225fca8d..744d8b558b 100644
--- a/chrome/content/zotero/preferences/preferences_general.xul
+++ b/chrome/content/zotero/preferences/preferences_general.xul
@@ -80,8 +80,10 @@
 				</menulist>
 			</hbox>
 			<checkbox
+				id="useInternalPDFReader-checkbox"
 				label="Use Zotero PDF reader for My Library (beta)"
-				preference="pref-useInternalPDFReader"/>
+				preference="pref-useInternalPDFReader"
+				hidden="true"/>
 		</groupbox>
 		
 		<groupbox id="zotero-prefpane-miscellaneous-groupbox">
diff --git a/chrome/content/zotero/xpcom/openPDF.js b/chrome/content/zotero/xpcom/openPDF.js
index bbc7c7ab13..67f394e6a5 100644
--- a/chrome/content/zotero/xpcom/openPDF.js
+++ b/chrome/content/zotero/xpcom/openPDF.js
@@ -36,7 +36,9 @@ Zotero.OpenPDF = {
 		else {
 			let item = pathOrItem;
 			let library = Zotero.Libraries.get(item.libraryID);
-			if (library.libraryType == 'user' && Zotero.Prefs.get('beta.useInternalPDFReader')) {
+			if (Zotero.isPDFBuild
+					&& library.libraryType == 'user'
+					&& Zotero.Prefs.get('beta.useInternalPDFReader')) {
 				let location = {
 					pageIndex: page - 1
 				};
diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index 9c3d2d4533..55411a2bce 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -228,7 +228,11 @@ Services.scriptloader.loadSubScript("resource://zotero/polyfill.js");
 			var version = yield deferred.promise;
 		}
 		Zotero.version = version;
-		Zotero.isDevBuild = Zotero.version.includes('beta') || Zotero.version.includes('SOURCE');
+		Zotero.isDevBuild = Zotero.version.includes('beta')
+			|| Zotero.version.includes('dev')
+			|| Zotero.version.includes('SOURCE');
+		Zotero.isPDFBuild = true // Toggle for testing
+			&& (Zotero.version.includes('dev') || Zotero.version.includes('SOURCE'));
 		
 		// OS platform
 		var win = Components.classes["@mozilla.org/appshell/appShellService;1"]
diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index 36f9c95d68..ce6ce5784b 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -4098,7 +4098,9 @@ var ZoteroPane = new function()
 				let item = await Zotero.Items.getAsync(itemID);
 				let library = Zotero.Libraries.get(item.libraryID);
 				// TEMP
-				if (library.libraryType == 'user' && Zotero.Prefs.get('beta.useInternalPDFReader')) {
+				if (Zotero.isPDFBuild
+						&& library.libraryType == 'user'
+						&& Zotero.Prefs.get('beta.useInternalPDFReader')) {
 					this.viewPDF(itemID, event && event.shiftKey);
 					return;
 				}