TLDR: News Article Summarizer

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "TLDR: News Article Summarizer",
  "description": "This extension automatically summarizes news articles.",
  "version": "0.1",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "declarativeContent",
    "http://www.nytimes.com/*",
    "http://news.yahoo.com/*",
    "http://localhost:8000/*",
    "http://news-article-summarizer.herokuapp.com/*",
    "tabs"
  ],
  "web_accessible_resources": [
    "circle-loading-animation.gif"
  ],
  "page_action": {
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    },
    "default_title": "TL;DR supports this site."
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png",
    "256": "images/icon256.png"
  }
}