TL;DR - Webpage Summarizer

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "TL;DR - Webpage Summarizer",
  "version": "4.0",
  "description": "Summarizes webpages",
  "permissions": [
    "activeTab",
    "tabs",
    "*://*.smmry.com/*"
  ],
  "icons": {
    "48": "icons/border-48.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_popup": "popup/choose_length_page.html",
    "default_icon": {
      "16": "icons/summarizer-icon-16.png",
      "32": "icons/summarizer-icon-32.png"
    }
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "js": [
        "polyfills/browser-polyfill.js",
        "inject-content/inject.js"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "web_accessible_resources": [
    "inject-content/inject.html",
    "inject-content/cleanslate.css"
  ]
}