Examine source code of InstaImageExtractor

{
  "manifest_version": 2,
  "name": "InstaImageExtracter",
  "description": "Easy get full-sized images or videos from Instagram pages from the context menu",
  "version": "1.0",
  "icons": {
    "16": "icon_16.png",
    "128": "icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.instagram.com/*",
        "https://instagram.com/*"
      ],
      "js": [
        "contentscript.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "menus"
  ],
  "browser_action": {
    "default_title": "InstaImageExtracter",
    "default_icon": "icon_128.png",
    "default_popup": "popup.html"
  }
}