Examine source code of Open tab with Respect

{
  "manifest_version": 2,
  "name": "Open tab with Respect",
  "version": "1.1",
  "description": "Adds option to right-clicked link's context menu to open tab as previous, next, first or last tab.",
  "author": "Fezcode",
  "developer": {
    "name": "Fezcode",
    "url": "https://github.com/fezcode"
  },
  "homepage_url": "https://github.com/fezcode/open-tab-with-respect",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "permissions": [
    "menus",
    "activeTab",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}