Examine source code of Text-to-Speech Readers

{
  "manifest_version": 2,
  "name": "Text-to-Speech Reader",
  "version": "1.0",
  "description": "Read selected text aloud with speed control.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "TTS Reader"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5aba7277-faa3-45ea-b888-6a0035db2118}"
    }
  }
}