Preview - Sneak peak at links

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Preview - Sneak peak at links",
  "version": "0.0.2",
  "manifest_version": 2,
  "description": "ALT+Click links for a popup preview",
  "icons": {
    "16": "icons/icon128.png",
    "48": "icons/icon128.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": "script-src 'self' https://www.google-analytics.com/analytics.js; object-src 'self'",
  "default_locale": "en",
  "background": {
    "scripts": [
      "src/bg/background.js"
    ],
    "persistent": true
  },
  "web_accessible_resources": [
    "static/*"
  ],
  "permissions": [
    "https://*/*",
    "http://*/*",
    "downloads"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "css": [
        "src/inject/inject.css"
      ],
      "all_frames": true,
      "match_about_blank": true
    },
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "all_frames": true,
      "js": [
        "js/jquery-1.12.4.min.js",
        "src/inject/content.js"
      ]
    }
  ]
}