manifest.json

{
  "name": "Code Snip",
  "version": "1.0",
  "manifest_version": 2,
  "description": "Copy code from Stack Overflow, Github, and AskUbuntu's websites expediting the time it takes you to debug issues.",
  "background": {
    "scripts": ["js/background.js"],
    "persistent": false
  },
   "icons": {
    "16" : "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Code Snip",
    "default_popup": "overlay.html"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
    "css": ["css/stackOverflow.css"],
    "js": ["js/stackOverflow.js", "js/contentscript.js", "js/copy-to-clipboard.js"],
    "matches": ["https://stackoverflow.com/*"]
    },
    {
    "css": ["css/github.css"],
    "js": ["js/github.js", "js/contentscript.js", "js/copy-to-clipboard.js"],
    "matches": ["https://github.com/*"]
    },
    {
    "css": ["css/ubuntu.css"],
    "js": ["js/ubuntu.js", "js/contentscript.js", "js/copy-to-clipboard.js"],
    "matches": ["https://askubuntu.com/*"]
    }
],
  "content_security_policy": "script-src 'self' https://apis.google.com; object-src 'self'"
}