Examine source code of Accessibility View

{
  "manifest_version": 2,
  "name": "Accessibility View",
  "description": "Accessibility View converts an arbitrary website into its accessibility relevant form.",
  "version": "1.3.39",
  "icons": {
    "128": "icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{601367d8-b1c0-48c6-be8b-5a6da4df4e9b}"
    }
  }
}