OctoEdit

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "OctoEdit",
  "version": "0.5.1",
  "description": "Syntax Highlighting mini-editor for GitHub.com",
  "manifest_version": 2,
  "permissions": [
    "storage"
  ],
  "options_page": "options.html",
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://github.com/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "pagenav-listener.js"
  ]
}