Examine source code of PastePass

{
  "manifest_version": 2,
  "name": "PastePass",
  "version": "1.0.1",
  "description": "Easily Paste Anywhere, Even on Restricted Websites!",
  "icons": {
    "16": "icons/pastepass-16.png",
    "32": "icons/pastepass-32.png",
    "48": "icons/pastepass-48.png",
    "128": "icons/pastepass-128.png"
  },
  "permissions": [
    "storage",
    "clipboardRead",
    "clipboardWrite",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/pastepass-32.png",
    "default_title": "PastePass",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "pastepass@example.com"
    }
  }
}