Examine source code of 1-Click Email URL

{
  "manifest_version": 2,
  "name": "1-Click Email URL",
  "version": "1.0.5resigned1",
  "description": "Click to email any URL with one click",
  "browser_action": {
    "default_icon": "icon.png"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b67f1257-24ea-48ef-8d84-384dd08fa4a0}"
    }
  }
}