diff --git a/toolkit/xre/nsAppRunner.cpp b/toolkit/xre/nsAppRunner.cpp
--- a/toolkit/xre/nsAppRunner.cpp
+++ b/toolkit/xre/nsAppRunner.cpp
@@ -5762,6 +5762,12 @@ int XREMain::XRE_main(int argc, char* ar
   if (!mAppData->remotingName) {
     mAppData->remotingName = mAppData->name;
   }
+
+  const char* appRemotingName = getenv("MOZ_APP_REMOTINGNAME");
+  if (appRemotingName) {
+    mAppData->remotingName = strdup(appRemotingName);
+  }
+
   // used throughout this file
   gAppData = mAppData.get();
 
diff --git a/widget/gtk/nsWindow.cpp b/widget/gtk/nsWindow.cpp
--- a/widget/gtk/nsWindow.cpp
+++ b/widget/gtk/nsWindow.cpp
@@ -3448,7 +3448,13 @@ void* nsWindow::GetNativeData(uint32_t a
 nsresult nsWindow::SetTitle(const nsAString& aTitle) {
   if (!mShell) return NS_OK;
 
-    // convert the string into utf8 and set the title.
+  const char* appTitle = getenv("MOZ_APP_TITLE");
+  if (appTitle) {
+    gtk_window_set_title(GTK_WINDOW(mShell), appTitle);
+    return NS_OK;
+  }
+
+  // convert the string into utf8 and set the title.
 #define UTF8_FOLLOWBYTE(ch) (((ch)&0xC0) == 0x80)
   NS_ConvertUTF16toUTF8 titleUTF8(aTitle);
   if (titleUTF8.Length() > NS_WINDOW_TITLE_MAX_LENGTH) {