diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 9519dd99476..49ace1f32ed 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -22,6 +22,7 @@ import time
 import zlib
 
 import werkzeug
+import werkzeug.exceptions
 import werkzeug.utils
 import werkzeug.wrappers
 import werkzeug.wsgi
@@ -44,7 +45,7 @@ from odoo.http import content_disposition, dispatch_rpc, request, \
     serialize_exception as _serialize_exception, Response
 from odoo.exceptions import AccessError, UserError, AccessDenied
 from odoo.models import check_method_name
-from odoo.service import db
+from odoo.service import db, security
 
 _logger = logging.getLogger(__name__)
 
@@ -505,11 +506,25 @@ class Home(http.Controller):
         if not odoo.tools.config['list_db']:
             values['disable_database_manager'] = True
 
+        # otherwise no real way to test debug mode in template as ?debug =>
+        # values['debug'] = '' but that's also the fallback value when
+        # missing variables in qweb
+        if 'debug' in values:
+            values['debug'] = True
+
         response = request.render('web.login', values)
         response.headers['X-Frame-Options'] = 'DENY'
         return response
 
+    @http.route('/web/become', type='http', auth='user', sitemap=False)
+    def switch_to_admin(self):
+        uid = request.env.user.id
+        if request.env.user._is_system():
+            uid = request.session.uid = odoo.SUPERUSER_ID
+            request.env['res.users']._invalidate_session_cache()
+            request.session.session_token = security.compute_session_token(request.session, request.env)
 
+        return http.redirect_with_hash(self._login_redirect(uid))
 
 class WebClient(http.Controller):
 
diff --git a/addons/web/static/src/js/chrome/abstract_web_client.js b/addons/web/static/src/js/chrome/abstract_web_client.js
index d23bbeb237f..80711fd24ed 100644
--- a/addons/web/static/src/js/chrome/abstract_web_client.js
+++ b/addons/web/static/src/js/chrome/abstract_web_client.js
@@ -132,6 +132,9 @@ var AbstractWebClient = Widget.extend(ServiceProviderMixin, KeyboardNavigationMi
                 self.action_manager.$el.on('scroll', core.bus.trigger.bind(core.bus, 'scroll'));
                 core.bus.trigger('web_client_ready');
                 odoo.isReady = true;
+                if (session.uid === 1) {
+                    self.$el.addClass('o_is_superuser');
+                }
             });
     },
 
diff --git a/addons/web/static/src/scss/navbar.scss b/addons/web/static/src/scss/navbar.scss
index 160a1b87558..367a374812d 100644
--- a/addons/web/static/src/scss/navbar.scss
+++ b/addons/web/static/src/scss/navbar.scss
@@ -1,4 +1,23 @@
+body.o_is_superuser .o_menu_systray {
+    background: repeating-linear-gradient(
+        135deg,
+        #d9b904, #d9b904 10px,
+        #373435 10px, #373435 20px
+    );
+    border-bottom-left-radius: 20px;
 
+    > li {
+        > a, > label {
+            &:hover {
+                background-color: fade_out($o-navbar-inverse-link-hover-bg, 0.5);
+            }
+        }
+    }
+
+    .show .dropdown-toggle {
+        background-color: fade_out($o-navbar-inverse-link-hover-bg, 0.5);
+    }
+}
 .o_main_navbar {
     position: relative;
     height: $o-navbar-height;
diff --git a/addons/web/static/src/xml/base.xml b/addons/web/static/src/xml/base.xml
index a37645ba85e..907a02c0237 100644
--- a/addons/web/static/src/xml/base.xml
+++ b/addons/web/static/src/xml/base.xml
@@ -247,6 +247,7 @@
     <div class="dropdown-divider o_debug_leave_section" role="separator"/>
     <a role="menuitem" href="#" data-action="split_assets" class="dropdown-item">Activate Assets Debugging</a>
     <a role="menuitem" href="#" data-action="regenerateAssets" class="dropdown-item">Regenerate Assets Bundles</a>
+    <a t-if="manager._is_admin" role="menuitem" href="/web/become" class="dropdown-item">Become Superuser</a>
     <a role="menuitem" href="#" data-action="leave_debug_mode" class="dropdown-item">Leave the Developer Tools</a>
 </t>
 <t t-name="WebClient.DebugManager.Action">
diff --git a/addons/web/views/webclient_templates.xml b/addons/web/views/webclient_templates.xml
index 339f52e9de7..fb5a70290a0 100644
--- a/addons/web/views/webclient_templates.xml
+++ b/addons/web/views/webclient_templates.xml
@@ -409,11 +409,15 @@
                     <t t-esc="message"/>
                 </p>
 
-                <input type="hidden" name="redirect" t-att-value="redirect"/>
                 <div t-attf-class="clearfix oe_login_buttons text-center mb-1 {{'pt-2' if form_small else 'pt-3'}}">
                     <button type="submit" class="btn btn-primary btn-block">Log in</button>
+                    <t t-if="debug">
+                        <button type="submit" name="redirect" value="/web/become" class="btn btn-link btn-sm btn-block">Log in as superuser</button>
+                    </t>
                     <div class="o_login_auth"/>
                 </div>
+
+                <input type="hidden" name="redirect" t-att-value="redirect"/>
             </form>
         </t>
     </template>