Examine source code of BrowserWall

{
  "name": "BrowserWall",
  "short_name": "BW",
  "background": {
    "scripts": [
      "scripts/main.js"
    ]
  },
  "manifest_version": 2,
  "web_accessible_resources": [
    "styles/main.css",
    "alert/*"
  ],
  "browser_action": {
    "default_icon": "icons/icon_32.png",
    "default_title": "BrowserWall",
    "default_popup": "options/options_popup_menu.html"
  },
  "version": "4.2",
  "default_locale": "en",
  "options_ui": {
    "page": "options/options_popup.html",
    "chrome_style": true
  },
  "permissions": [
    "webRequest",
    "webNavigation",
    "webRequestBlocking",
    "storage",
    "management",
    "notifications",
    "tabs",
    "http://*/",
    "https://*/"
  ],
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "64": "icons/icon_64.png",
    "128": "icons/icon_128.png",
    "256": "icons/icon_256.png"
  },
  "applications": {
    "gecko": {
      "id": "addon@browserwall.com",
      "strict_min_version": "57.0"
    }
  }
}