Examine source code of ReadLater

{
  "description": "A simple reading list that saves webpages to revisit later.",
  "manifest_version": 2,
  "name": "ReadLater",
  "version": "1.0.2",
  "homepage_url": "https://github.com/Implosions/ReadLater",
  "icons": {
    "32": "icons/readlater-32.png",
    "64": "icons/readlater-64.png",
    "128": "icons/readlater-128.png"
  },
  "permissions": [
    "contextMenus",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/readlater-32.png",
    "default_title": "ReadLater",
    "default_popup": "popup/readlater.html"
  }
}