Examine source code of Simple Script Blockers

{
  "manifest_version": 2,
  "name": "Simple Script Blocker",
  "version": "1.0",
  "description": "Block or allow JavaScript on the current tab.",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Script Blocker"
  },
  "icons": {
    "48": "icon.png"
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2c8872a3-f738-4f64-b31b-cd2a7c5e6c9e}"
    }
  }
}