BibTeX entry from URL

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "BibTeX entry from URL",
  "short_name": "url_to_bib",
  "description": "This extension provides a BibTeX reference for the active URL",
  "version": "1.3.2",
  "options_page": "options.html",
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "background": {
    "persistent": false,
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "images/icon30.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "30": "images/icon30.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "permissions": [
    "contextMenus",
    "tabs",
    "activeTab"
  ]
}