Examine source code of Clear Tabs

{
  "manifest_version": 2,
  "name": "Clear Tabs",
  "short_name": "Clear Tabs",
  "description": "This extension clears all but the active tab in your browser.",
  "version": "1.0.5.2resigned1",
  "icons": {
    "48": "./icons/ClearTab48.png",
    "64": "./icons/ClearTab64.png",
    "96": "./icons/ClearTab96.png",
    "128": "./icons/ClearTab128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "Clear Tabs",
    "default_icon": {
      "32": "./icons/ClearTab32.png",
      "64": "./icons/ClearTab64.png"
    }
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{442cfece-ae4e-49da-8ec2-c3f984608d60}"
    }
  }
}