Examine source code of Brave Heart

{
  "manifest_version": 2,
  "name": "__MSG_manifest_name__",
  "short_name": "__MSG_manifest_short_name__",
  "description": "__MSG_manifest_description__",
  "homepage_url": "https://github.com/m4ktub/brave-heart",
  "version": "1.0.2",
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "64": "images/icon64.png",
    "128": "images/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "options_ui": {
    "page": "pages/options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_title": "__MSG_manifest_default_title__",
    "default_popup": "pages/popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "64": "images/icon64.png",
      "128": "images/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "brave-heart@m4ktub.ws"
    }
  }
}