Examine source code of RSVP Speed Reader

{
  "manifest_version": 2,
  "name": "RSVP Speed Reader",
  "version": "1.0.1",
  "description": "Addon for RSVP Reading. (Rapid Serial Visual Presentation)",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "tabs"
  ],
  "icons": {
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "72": "icons/icon72.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "overlay.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{858b55b4-3f51-4041-9c1a-918fe9ee835a}",
      "strict_min_version": "79.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}