Examine source code of Reading Mode - Text Zoom

{
  "name": "MSG_extName",
  "icons": {
    "16": "assistants/images/icon16.png",
    "32": "assistants/images/icon32.png",
    "64": "assistants/images/icon64.png",
    "128": "assistants/images/icon128.png",
    "512": "assistants/images/icon512.png"
  },
  "description": "MSG_extDescription",
  "version": "1.2.5",
  "options_page": "html/settings.html",
  "default_locale": "en",
  "permissions": [
    "<all_urls>",
    "scripting",
    "storage"
  ],
  "background": {
    "scripts": [
      "js/worker.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "name": "MSG_extName",
    "default_title": "MSG_titleDefault",
    "default_icon": "assistants/images/icon512.png",
    "default_popup": "html/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "assistants/libs/css/zoom.css"
      ],
      "js": [
        "assistants/libs/js/jquery.js",
        "assistants/libs/js/alertify.js",
        "assistants/libs/js/mousetrap.js",
        "assistants/libs/js/util.js",
        "assistants/libs/js/zoom.js",
        "assistants/injectScripts/hideMedia.js",
        "assistants/injectScripts/overlyHelper.js",
        "js/content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{87728dd9-51d0-4e15-93a7-75b8b4ccd214}"
    }
  }
}