--- a/tools/mach_commands.py
+++ b/tools/mach_commands.py
@@ -4,16 +4,17 @@
 
 from __future__ import absolute_import, unicode_literals
 
 import sys
 import os
 import stat
 import platform
 import errno
+import subprocess
 
 from mach.decorators import (
     CommandArgument,
     CommandProvider,
     Command,
 )
 
 from mozbuild.base import MachCommandBase, MozbuildObject
@@ -75,16 +76,69 @@ class UUIDProvider(object):
         if format in [None, 'cpp', 'c++']:
             u = u.hex
             print('{ 0x%s, 0x%s, 0x%s, \\' % (u[0:8], u[8:12], u[12:16]))
             pairs = tuple(map(lambda n: u[n:n+2], range(16, 32, 2)))
             print(('  { ' + '0x%s, ' * 7 + '0x%s } }') % pairs)
 
 
 @CommandProvider
+class RageProvider(MachCommandBase):
+    @Command('rage', category='misc',
+             description='Express your frustration')
+    def rage(self):
+        """Have a bad experience developing Firefox? Run this command to
+        express your frustration.
+
+        This command will open your default configured web browser to a short
+        form where you can submit feedback. Just close the tab when done.
+        """
+        import getpass
+        import urllib
+        import webbrowser
+
+        # Try to resolve the current user.
+        user = None
+        with open(os.devnull, 'wb') as null:
+            if os.path.exists(os.path.join(self.topsrcdir, '.hg')):
+                try:
+                    user = subprocess.check_output(['hg', 'config',
+                                                    'ui.username'],
+                                                   cwd=self.topsrcdir,
+                                                   stderr=null)
+
+                    i = user.find('<')
+                    if i >= 0:
+                        user = user[i + 1:-2]
+                except subprocess.CalledProcessError:
+                    pass
+            elif os.path.exists(os.path.join(self.topsrcdir, '.git')):
+                try:
+                    user = subprocess.check_output(['git', 'config', '--get',
+                                                    'user.email'],
+                                                   cwd=self.topsrcdir,
+                                                   stderr=null)
+                except subprocess.CalledProcessError:
+                    pass
+
+        if not user:
+            try:
+                user = getpass.getuser()
+            except Exception:
+                pass
+
+        url = 'https://docs.google.com/a/mozilla.com/forms/d/e/1FAIpQLSeDVC3IXJu5d33Hp_ZTCOw06xEUiYH1pBjAqJ1g_y63sO2vvA/viewform'
+        if user:
+            url += '?entry.1281044204=%s' % urllib.quote(user)
+
+        print('Please leave your feedback in the opened web form')
+        webbrowser.open_new_tab(url)
+
+
+@CommandProvider
 class PastebinProvider(object):
     @Command('pastebin', category='misc',
         description='Command line interface to pastebin.mozilla.org.')
     @CommandArgument('--language', default=None,
                      help='Language to use for syntax highlighting')
     @CommandArgument('--poster', default='',
                      help='Specify your name for use with pastebin.mozilla.org')
     @CommandArgument('--duration', default='day',