Examine source code of Tabs manager

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.8",
  "description": "__MSG_extensionDescription__",
  "author": "François Gueguen",
  "developer": {
    "name": "François Gueguen",
    "url": "https://github.com/fgueguen"
  },
  "homepage_url": "https://addons.mozilla.org/fr/firefox/addon/duplicated-tabs-manager/",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "tabs",
    "notifications"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "Sort opened tabs and find duplicated",
    "default_popup": "popup/sort_tabs.html"
  },
  "background": {
    "scripts": [
      "scripts/toolManager.js",
      "scripts/badgeManager.js",
      "scripts/tabManager.js",
      "background.js"
    ]
  },
  "default_locale": "en"
}