Examine source code of Read Mode Togglec

{
  "manifest_version": 2,
  "name": "Read Mode Toggle",
  "version": "1.0",
  "description": "Toggle Reader Mode for the current tab.",
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Toggle Reader Mode"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f0a73a0b-4b09-4613-b64b-2147d3adb3ea}"
    }
  }
}