And them's the facts

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "And them's the facts",
  "description": "Adds the catch phrase at the end of every Wikipedia article",
  "icons": {
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "version": "0.2",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "include_globs": [
        "*://*.wikipedia.*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}