diff --git a/README.md b/README.md
new file mode 100644
index 00000000..6765ff80
--- /dev/null
+++ b/README.md
@@ -0,0 +1,25 @@
+# About GridTracker
+
+# Developing GridTracker
+
+GridTracker runs using [NWJS](https://nwjs.io/), a tools that wraps both Chrome windows and node processes into a native application.
+
+To work on GridTracker you need to clone this git repository and then invoke NWJS with the contents of `package.nw`.
+
+NWJS comes in two flavors, "normal" and "sdk". GridTracker is distributed with the normal flavor, but for development work
+we recommend the SDK flavor because it provides access to Chrome's Developer Tools, among other things.
+
+## Developing on Windows
+
+To access the Developer Tools, right-click on an unused area of a window, or press F12.
+
+## Developing on Linux
+
+To access the Developer Tools, right-click on an unused area of a window, or press F12.
+
+## Developing on Mac
+
+We suggest using the `macos/run.sh` script to launch GridTracker while developing. It will download the sdk flavor of NWJS if needed,
+and use it to run the app.
+
+To access the Developer Tools, right-click on an unused area of a window, or press F12.
diff --git a/macos/run.sh b/macos/run.sh
index 62c28900..4431973c 100755
--- a/macos/run.sh
+++ b/macos/run.sh
@@ -1,16 +1,21 @@
 NWJS_VERSION=0.49.0
+NWJS_FULL_NAME=nwjs-sdk-v$NWJS_VERSION-osx-x64
 
-if [ ! -e build/macos/nwjs-v$NWJS_VERSION-osx-x64/nwjs.app ]; then
-  echo "Downloading NWJS $NWJS_VERSION"
+if [ ! -e build/macos/$NWJS_FULL_NAME/nwjs.app ]; then
+  echo "Downloading NWJS $NWJS_VERSION ($NWJS_FULL_NAME)"
   mkdir -p build/macos
   cd build/macos
-  curl -O https://dl.nwjs.io/v$NWJS_VERSION/nwjs-v$NWJS_VERSION-osx-x64.zip
-  unzip nwjs-v$NWJS_VERSION-osx-x64.zip
+  curl -O https://dl.nwjs.io/v$NWJS_VERSION/$NWJS_FULL_NAME.zip
+  unzip $NWJS_FULL_NAME.zip
   cd ../..
 fi
 
+# Disable `product_string` before running nwjs (see https://github.com/nwjs/nw.js/issues/7253)
 sed -i "" -e s/\"product_string\"/\"ignore_product_string\"/g package.nw/package.json
 
-build/macos/nwjs-v$NWJS_VERSION-osx-x64/nwjs.app/Contents/MacOS/nwjs ./package.nw
+# Give time (15 seconds) for nwjs to start and then restore `product_string`
+( sleep 15 ; sed -i "" -e s/\"ignore_product_string\"/\"product_string\"/g package.nw/package.json ) &
+
+build/macos/$NWJS_FULL_NAME/nwjs.app/Contents/MacOS/nwjs ./package.nw
+
 
-sed -i "" -e s/\"ignore_product_string\"/\"product_string\"/g package.nw/package.json
diff --git a/package.nw/GridTracker.html b/package.nw/GridTracker.html
index 83238cd2..821997db 100644
--- a/package.nw/GridTracker.html
+++ b/package.nw/GridTracker.html
@@ -153,7 +153,7 @@
                <div id="txrxdec" style="background-color:Green;border-style:outset;border-color:yellow;border-width:3px" class="roundBorder">waiting for message</div>
             </div>
 
-            <div id="pskReporterBandActivityDiv" class="roundBorder" style="position:relative;background-color:#000;border:1px solid purple;margin:1px;height:49px;margin-bottom:1px;padding:0px" title="PSK-Reporter Band Activity" oncontextmenu="toggleBaWindow()" >
+            <div id="pskReporterBandActivityDiv" class="roundBorder" style="position:relative;background-color:#000;border:1px solid purple;margin:1px;height:49px;margin-bottom:1px;padding:0px" title="PSK-Reporter Band Activity" oncontextmenu="toggleBaWindow(event)" >
                         <div id="graphDiv" style="bottom:0;position: absolute;width:100%;padding:0px;margin-bottom:2px">
                   <br />...no data yet...<br />
                   &nbsp;
@@ -1839,4 +1839,4 @@
       <div id="selectNodeDiv" style="-webkit-user-select:text;display:block;zIndex:-10000"></div>
       </div>
    </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/package.nw/gt_bandactivity.html b/package.nw/gt_bandactivity.html
index 6d67e52d..63ad3281 100644
--- a/package.nw/gt_bandactivity.html
+++ b/package.nw/gt_bandactivity.html
@@ -33,9 +33,10 @@ document.addEventListener("drop", function (event) {
 });
 
 document.addEventListener('contextmenu', function(ev) {
-		window.opener.openBaWindow(false);
-		ev.preventDefault();
-
+   window.opener.toggleBaWindow(ev);
+   if (process.versions['nw-flavor'] != "sdk") {
+      ev.preventDefault();
+   }
 });
 
 
@@ -43,7 +44,7 @@ document.addEventListener('contextmenu', function(ev) {
 		<script src="./lib/screens.js"></script>
    </head>
 
-<body id='mainBody'  style="-webkit-app-region:drag;margin:0px;right:0px;left:0px;bottom:0px;top:0px;display:block;background-color:#000000FF;padding:0px;text-align:center;vertical-align:middle;position:absolute;z-index:600;" oncontextmenu="window.opener.showBaWindow(false)" >
+<body id='mainBody'  style="-webkit-app-region:drag;margin:0px;right:0px;left:0px;bottom:0px;top:0px;display:block;background-color:#000000FF;padding:0px;text-align:center;vertical-align:middle;position:absolute;z-index:600;">
 <div id="pskReporterBandActivityDiv" style="position:relative;background-color:#000;border:1px solid purple;margin:1px;height:49px;margin-bottom:1px;padding:0px" title="PSK-Reporter Band Activity">
         <div id="graphDiv" style="bottom:0;position: absolute;width:100%;padding:0px;margin-bottom:2px">
                   <br />...no data yet...<br />
@@ -51,4 +52,4 @@ document.addEventListener('contextmenu', function(ev) {
                </div>
 		</div>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/package.nw/gt_chat.html b/package.nw/gt_chat.html
index 0094bef4..7f38476e 100644
--- a/package.nw/gt_chat.html
+++ b/package.nw/gt_chat.html
@@ -262,6 +262,8 @@ function openIdCid( from )
 
 function openLookupCid( from )
 {
+	from.preventDefault();
+
 	if ( typeof window.opener.g_gtFlagPins[from.currentTarget.id] != "undefined" )
 	{
 		doLookup(window.opener.g_gtFlagPins[from.currentTarget.id].call);
diff --git a/package.nw/gt_conditions.html b/package.nw/gt_conditions.html
index 92b008b8..d089790f 100644
--- a/package.nw/gt_conditions.html
+++ b/package.nw/gt_conditions.html
@@ -37,8 +37,10 @@ table, th, td {
 </style>
 <script>
 
-document.oncontextmenu = function() {
-  return false;
+document.oncontextmenu = function(event) {
+  if (process.versions['nw-flavor'] != "sdk") {
+    ev.preventDefault();
+  }
 }
 
 document.addEventListener("dragover", function (event) {
diff --git a/package.nw/gt_popup.html b/package.nw/gt_popup.html
index 8da95957..2ccfb184 100644
--- a/package.nw/gt_popup.html
+++ b/package.nw/gt_popup.html
@@ -66,8 +66,10 @@ function onMyKeyDown(event)
 	window.opener.onMyKeyDown(event);
 }
 
-document.oncontextmenu = function() {
-  return false;
+document.oncontextmenu = function(event) {
+  if (process.versions['nw-flavor'] != "sdk") {
+    ev.preventDefault();
+  }
 }
 
 </script>
diff --git a/package.nw/gt_roster.html b/package.nw/gt_roster.html
index 5b0aa835..118a6a8f 100644
--- a/package.nw/gt_roster.html
+++ b/package.nw/gt_roster.html
@@ -212,7 +212,9 @@
 				<div id="instancesDiv" style="display:none;" ></div>
 			</div>
 
-			<div id="rosterTable" style="overflow:auto;overflow-x:hidden;" ></div>
+			<div oncontextmenu="handleContextMenu(event);">
+				<div id="rosterTable" style="overflow:auto;overflow-x:hidden;"></div>
+			</div>
 		</div>
 		<div id="editView" class="roundBorder"  style="height:100%;border:3px solid #066;padding:10px;margin:10px;display:none;">
 			<div style='display:block;font-size:larger'>Callsign, CQ and DXCC Ignores</div><br/>
diff --git a/package.nw/lib/gt.js b/package.nw/lib/gt.js
index a7d33201..0dc94dbb 100644
--- a/package.nw/lib/gt.js
+++ b/package.nw/lib/gt.js
@@ -39,6 +39,8 @@ if (g_platform == "windows")
 var gui = require('nw.gui');
 var win = gui.Window.get();
 
+var g_developerMode = (process.versions['nw-flavor'] == "sdk");
+
 var g_popupWindowHandle = null;
 var g_callRosterWindowHandle = null;
 var g_conditionsWindowHandle = null;
@@ -4789,6 +4791,7 @@ function initMap() {
 
 	//mapDiv.addEventListener('mouseout', mapLoseFocus, false);
 	mapDiv.addEventListener('mouseleave', mapLoseFocus, false);
+	mapDiv.addEventListener('contextmenu', function(event) { event.preventDefault(); })
 
 	g_map.on('pointerdown', function (event) {
 
@@ -4836,7 +4839,6 @@ function initMap() {
 			mouseOutOfDataItem();
 	});
 
-
 	document.getElementById("menuDiv").style.display = "block";
 
 	dayNight.init(g_map);
@@ -6720,12 +6722,13 @@ function resetSearch()
 
 function showWorkedByCall(callsign, evt)
 {
+	evt.preventDefault();
+
 	resetSearch();
 	g_searchWB = callsign;
 	if ( event.shiftKey == true )
 		g_filterQSL = "true";
 	openInfoTab('qsobox', 'workedBoxDiv', showWorkedBox);
-
 }
 
 function showWorkedSearchChanged(object, index) {
@@ -7546,8 +7549,9 @@ function showSettingsBox() {
 	}
 }
 
-function toggleBaWindow()
-{
+function toggleBaWindow(event) {
+	event.preventDefault();
+
 	if (g_baWindowHandle == null)
 	{
 		openBaWindow(true);
@@ -11199,9 +11203,11 @@ function loadAdifSettings()
 
 function startupVersionInit() {
 
-	document.body.addEventListener('contextmenu', function(ev) {
-		ev.preventDefault();
-	});
+	if (!g_developerMode) {
+		document.body.addEventListener('contextmenu', function(ev) {
+			ev.preventDefault();
+		});
+	}
 
 	imSureCheck.checked = false;
 	stopAskingCheckbox.checked = g_appSettings.stopAskingVersion;
diff --git a/package.nw/lib/roster.js b/package.nw/lib/roster.js
index 5b0ec63b..9aeb0455 100644
--- a/package.nw/lib/roster.js
+++ b/package.nw/lib/roster.js
@@ -42,6 +42,7 @@ var g_callsignDatabaseDXCC = {};
 var g_callsignDatabaseUS = {}
 var g_callsignDatabaseUSplus = {};
 
+var g_developerMode = (process.versions['nw-flavor'] == "sdk");
 
 var g_modeColors = {};
 g_modeColors["FT4"] = '1111FF';
@@ -3036,113 +3037,6 @@ function init()
 	});
 	g_dxccMenu.append(item);
 
-	document.body.addEventListener('contextmenu', function(ev) {
-		ev.preventDefault();
-		if ( editView.style.display == "inline-block" )
-			return false;
-		var len = Object.keys(g_blockedCalls).length;
-		if ( len > 0 )
-		{
-			g_clearIgnores.enabled = true;
-			g_clearIgnores.label = "Clear Call Ignore" + ((len > 1 )?"s ("+len+")":"");
-			g_clearIgnoresCall.enabled = true;
-			g_clearIgnoresCall.label = "Clear Ignore" + ((len > 1 )?"s ("+len+")":"");
-		}
-		else
-		{
-			g_clearIgnores.label = "Clear Call Ignore";
-			g_clearIgnores.enabled = false;
-			g_clearIgnoresCall.label = "Clear Ignore";
-			g_clearIgnoresCall.enabled = false;
-		}
-		len = Object.keys(g_blockedDxcc).length;
-		if ( len > 0 )
-		{
-			g_clearDxccIgnoreMainMenu.enabled = true;
-			g_clearDxccIgnoreMainMenu.label = "Clear DXCC Ignore" + ((len > 1 )?"s ("+len+")":"");
-			g_clearDxccIgnore.enabled = true;
-			g_clearDxccIgnore.label = "Clear Ignore" + ((len > 1 )?"s ("+len+")":"");
-		}
-		else
-		{
-			g_clearDxccIgnoreMainMenu.label = "Clear DXCC Ignore";
-			g_clearDxccIgnoreMainMenu.enabled = false;
-			g_clearDxccIgnore.label = "Clear Ignore";
-			g_clearDxccIgnore.enabled = false;
-		}
-		len = Object.keys(g_blockedCQ).length;
-		if ( len > 0 )
-		{
-			g_clearCQIgnoreMainMenu.enabled = true;
-			g_clearCQIgnoreMainMenu.label = "Clear CQ Ignore" + ((len > 1 )?"s ("+len+")":"");
-			g_clearCQIgnore.enabled = true;
-			g_clearCQIgnore.label = "Clear Ignore" + ((len > 1 )?"s ("+len+")":"");
-		}
-		else
-		{
-			g_clearCQIgnoreMainMenu.label = "Clear CQ Ignore";
-			g_clearCQIgnoreMainMenu.enabled = false;
-			g_clearCQIgnore.label = "Clear Ignore";
-			g_clearCQIgnore.enabled = false;
-		}
-		if ( typeof ev.target != 'undefined' )
-		{
-			var name = ev.target.getAttribute("name");
-			if ( name == "Callsign" )
-			{
-				g_targetHash =  ev.target.parentNode.id;
-				g_callMenu.popup(ev.x, ev.y);
-			}
-			else if ( name == "Calling" )
-			{
-				g_targetHash =  ev.target.parentNode.id;
-				g_callingMenu.popup(ev.x, ev.y);
-			}
-			else if ( name == "CQ" )
-			{
-				if (  callRoster[ev.target.parentNode.id].DXcall != "CQ" )
-				{
-					g_targetCQ =  ev.target.parentNode.id;
-					g_CQMenu.popup(ev.x, ev.y);
-				}
-			}
-			else if ( name && name.startsWith("DXCC")  )
-			{
-				var dxcca = name.split("(");
-				var dxcc = parseInt(dxcca[1]);
-				g_targetDxcc = dxcc;
-				g_dxccMenu.popup(ev.x, ev.y);
-			}
-			else
-			{
-				if ( g_rosterSettings.compact == false )
-				{
-					g_menu.popup(ev.x, ev.y);
-				}
-				else
-				{
-					g_compactMenu.popup(ev.x, ev.y);
-				}
-			}
-		}
-		else
-		{
-			if ( g_rosterSettings.compact == false )
-			{
-				g_menu.popup(ev.x, ev.y);
-			}
-			else
-			{
-				g_compactMenu.popup(ev.x, ev.y);
-			}
-		}
-
-
-
-		return false;
-	});
-
-
 	callsignNeed.value = g_rosterSettings.callsign;
 	huntMode.value = g_rosterSettings.hunting;
 	huntNeed.value = g_rosterSettings.huntNeed;
@@ -3192,6 +3086,114 @@ function init()
 
 }
 
+function handleContextMenu(ev) {
+	if ( editView.style.display == "inline-block" )
+		return false;
+
+	var len = Object.keys(g_blockedCalls).length;
+	if ( len > 0 )
+	{
+		g_clearIgnores.enabled = true;
+		g_clearIgnores.label = "Clear Call Ignore" + ((len > 1 )?"s ("+len+")":"");
+		g_clearIgnoresCall.enabled = true;
+		g_clearIgnoresCall.label = "Clear Ignore" + ((len > 1 )?"s ("+len+")":"");
+	}
+	else
+	{
+		g_clearIgnores.label = "Clear Call Ignore";
+		g_clearIgnores.enabled = false;
+		g_clearIgnoresCall.label = "Clear Ignore";
+		g_clearIgnoresCall.enabled = false;
+	}
+	len = Object.keys(g_blockedDxcc).length;
+	if ( len > 0 )
+	{
+		g_clearDxccIgnoreMainMenu.enabled = true;
+		g_clearDxccIgnoreMainMenu.label = "Clear DXCC Ignore" + ((len > 1 )?"s ("+len+")":"");
+		g_clearDxccIgnore.enabled = true;
+		g_clearDxccIgnore.label = "Clear Ignore" + ((len > 1 )?"s ("+len+")":"");
+	}
+	else
+	{
+		g_clearDxccIgnoreMainMenu.label = "Clear DXCC Ignore";
+		g_clearDxccIgnoreMainMenu.enabled = false;
+		g_clearDxccIgnore.label = "Clear Ignore";
+		g_clearDxccIgnore.enabled = false;
+	}
+	len = Object.keys(g_blockedCQ).length;
+	if ( len > 0 )
+	{
+		g_clearCQIgnoreMainMenu.enabled = true;
+		g_clearCQIgnoreMainMenu.label = "Clear CQ Ignore" + ((len > 1 )?"s ("+len+")":"");
+		g_clearCQIgnore.enabled = true;
+		g_clearCQIgnore.label = "Clear Ignore" + ((len > 1 )?"s ("+len+")":"");
+	}
+	else
+	{
+		g_clearCQIgnoreMainMenu.label = "Clear CQ Ignore";
+		g_clearCQIgnoreMainMenu.enabled = false;
+		g_clearCQIgnore.label = "Clear Ignore";
+		g_clearCQIgnore.enabled = false;
+	}
+	if ( typeof ev.target != 'undefined' )
+	{
+		var name = ev.target.getAttribute("name");
+		if ( name == "Callsign" )
+		{
+			g_targetHash =  ev.target.parentNode.id;
+			g_callMenu.popup(ev.x, ev.y);
+		}
+		else if ( name == "Calling" )
+		{
+			g_targetHash =  ev.target.parentNode.id;
+			g_callingMenu.popup(ev.x, ev.y);
+		}
+		else if ( name == "CQ" )
+		{
+			if (  callRoster[ev.target.parentNode.id].DXcall != "CQ" )
+			{
+				g_targetCQ =  ev.target.parentNode.id;
+				g_CQMenu.popup(ev.x, ev.y);
+			}
+		}
+		else if ( name && name.startsWith("DXCC")  )
+		{
+			var dxcca = name.split("(");
+			var dxcc = parseInt(dxcca[1]);
+			g_targetDxcc = dxcc;
+			g_dxccMenu.popup(ev.x, ev.y);
+		}
+		else
+		{
+			if ( g_rosterSettings.compact == false )
+			{
+				g_menu.popup(ev.x, ev.y);
+			}
+			else
+			{
+				g_compactMenu.popup(ev.x, ev.y);
+			}
+		}
+	}
+	else
+	{
+		if ( g_rosterSettings.compact == false )
+		{
+			g_menu.popup(ev.x, ev.y);
+		}
+		else
+		{
+			g_compactMenu.popup(ev.x, ev.y);
+		}
+	}
+
+	if (!g_developerMode) {
+		ev.preventDefault();
+	}
+
+	return false;
+}
+
 function getTypeFromMode(mode)
 {
 	if (mode in g_modes)
diff --git a/package.nw/lib/stats.js b/package.nw/lib/stats.js
index 62875a77..409661f0 100644
--- a/package.nw/lib/stats.js
+++ b/package.nw/lib/stats.js
@@ -1,8 +1,8 @@
 // GridTracker ©2020 N0TTL
 
 
-document.oncontextmenu = function() {
- return false;
+document.oncontextmenu = function(event) {
+	event.preventDefault();
 }
 
 document.addEventListener("dragover", function (event) {
@@ -201,4 +201,4 @@ function reloadInfo( bandOrMode )
 	if (waswaczoneBoxDiv.style.display == "block") {
 		window.opener.showWASWACzoneBox();
 	}
-}
\ No newline at end of file
+}