Issue 4059 - Adapt the manifest for Edge (awaiting commit)

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__",
   {%- endif %}
 
   "short_name": "__MSG_name__",
   "description": "__MSG_description__",
   "default_locale": "en_US",
   "version": {{version|json}},
+  "author": {{metadata.get('general', 'author')|json}},
 
   {%- if metadata.has_section('compat') and metadata.has_option('compat', 'chrome') %}
   "minimum_chrome_version": {{metadata.get('compat', 'chrome')|json}},
   {%- endif %}
 
   {%- if pageAction %}
   "page_action": {
     "default_icon": {{pageAction.icon|json}},
     {%- if pageAction.popup %}
     "default_popup": {{pageAction.popup|json}},
@@ skipping 19 matching lines @@
   {%- if permissions %}
   "permissions": {{permissions|json}},
   {%- endif %}
 
   {%- if optionalPermissions %}
     "optional_permissions": {{optionalPermissions|json}},
   {%- endif %}
 
   {%- if backgroundScripts %}
   "background": {
-    "scripts": {{backgroundScripts|json}}
+    "scripts": {{backgroundScripts|json}},
+    "persistent": true
   },
   {%- endif %}
 
   {%- if metadata.has_option('general', 'options') %}
   "options_page": {{metadata.get('general', 'options')|json}},
   {%- endif %}
 
   {%- if metadata.has_option('general', 'devtools') %}
   "devtools_page": {{metadata.get('general', 'devtools')|json}},
   {%- endif %}
 
   {%- if contentScripts %}
   "content_scripts": {{contentScripts|json}},
   {%- endif %}
 
   {%- if webAccessible %}
   "web_accessible_resources": {{webAccessible|json}},
   {%- endif %}
 
   {%- if metadata.has_option('general', 'managedStorageSchema') %}
   "storage": {
     "managed_schema": {{metadata.get('general', 'managedStorageSchema')|json}}
   },
   {%- endif %}
 
   "_dummy": false
 }