Examine source code of Send via Email

{
  "manifest_version": 2,
  "name": "Send via Email",
  "version": "1.0",
  "description": "Αποστολή της τρέχουσας σελίδας μέσω Gmail, Outlook ή Yahoo",
  "default_locale": "en",
  "permissions": [
    "activeTab",
    "tabs",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    },
    "default_title": "Αποστολή μέσω Email",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentscript.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4280653a-40ce-4a0c-9b3c-c670638b5e50}"
    }
  }
}