Examine source code of ImgFullRes

{
  "manifest_version": 2,
  "version": "1.0.1",
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "author": "Salomax",
  "homepage_url": "https://github.com/sal0max/img-full-res",
  "icons": {
    "48": "images/ic_wallpaper.svg",
    "96": "images/ic_wallpaper.svg"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "page_action": {
    "default_icon": "images/ic_wallpaper_black.svg",
    "default_title": "__MSG_pageActionTitle__"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{05f54ef5-aa1d-44f8-b112-5cb7dad691c2}"
    }
  }
}