Examine source code of Comics Goose

{
  "manifest_version": 2,
  "name": "Comics Goose",
  "version": "0.4.3",
  "applications": {
    "gecko": {
      "id": "comicsgoose@furby.com"
    }
  },
  "description": "No more webcomic bookmarking woes",
  "icons": {
    "32": "resources/icons/goose.svg"
  },
  "permissions": [
    "activeTab",
    "menus",
    "notifications",
    "storage",
    "tabs"
  ],
  "optional_permissions": [
    "bookmarks"
  ],
  "background": {
    "scripts": [
      "resources/js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "resources/icons/goose_small_light.svg",
    "theme_icons": [
      {
        "light": "resources/icons/goose_small_light.svg",
        "dark": "resources/icons/goose_small_dark.svg",
        "size": 16
      },
      {
        "light": "resources/icons/goose_small_light.svg",
        "dark": "resources/icons/goose_small_dark.svg",
        "size": 32
      }
    ],
    "default_title": "Comics Goose",
    "default_popup": "resources/html/popup.html",
    "browser_style": true
  },
  "sidebar_action": {
    "default_icon": "resources/icons/goose_small_light.svg",
    "default_title": "Comics Goose",
    "default_panel": "resources/html/index.html",
    "browser_style": true
  },
  "options_ui": {
    "page": "resources/html/options.html",
    "browser_style": true
  }
}