Issue 6552 - Support arbitrary manifest values

templates/manifest.json.tmpl

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 {
   "manifest_version": 2,
   {%- if releaseBuild %}
   "name": "__MSG_name__",
   {%- else %}
   "name": "__MSG_name_devbuild__",
@@ skipping 55 matching lines @@
     "default_popup": {{browserAction.popup|json}},
     {%- endif %}
     "default_title": "__MSG_name__"
   },
   {%- endif %}
 
   {%- if icons %}
   "icons": {{icons|json}},
   {%- endif %}
 
-  {%- if extra %}
-    {%- for k, v in extra.items() %}
-  "{{k}}":{{v|json}},
-    {%- endfor %}
-  {%- endif %}
-
   {%- if backgroundScripts %}
   "background": {
     "scripts": {{backgroundScripts|json}},
     "persistent": true
   },
   {%- endif %}
 
   {%- if metadata.has_option('general', 'options') %}
   {%- if type != 'edge' %}
   "options_ui": {
     "page": {{metadata.get('general', 'options')|json}},
     "open_in_tab": true
   },
   {%- else %}
   "options_page": {{metadata.get('general', 'options')|json}},
   {%- endif %}
   {%- endif %}
 
-  {%- if metadata.has_option('general', 'devtools') %}
-  "devtools_page": {{metadata.get('general', 'devtools')|json}},
-  {%- endif %}
-
   {%- if contentScripts %}
   "content_scripts": {{contentScripts|json}},
   {%- endif %}
 
-  {%- if metadata.has_option('general', 'managedStorageSchema') %}
-  "storage": {
-    "managed_schema": {{metadata.get('general', 'managedStorageSchema')|json}}
-  },
-  {%- endif %}
-
-  {%- if metadata.has_option('general', 'contentSecurityPolicy') %}
-  "content_security_policy": {{metadata.get('general', 'contentSecurityPolicy')|json}},
-  {%- endif %}
-
   "_dummy": false
 }