Examine source code of Zoom Page WE

{
  "manifest_version": 2,
  "name": "Zoom Page WE",
  "version": "19.13",
  "description": "Zoom web pages (either per-site or per-tab) using full-page zoom, text-only zoom, automatic fit-to-width and minimum font size.",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "128": "icon128-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "zoompage-we@DW-dev",
      "strict_min_version": "51.0"
    }
  },
  "permissions": [
    "tabs",
    "webNavigation",
    "contextMenus",
    "notifications",
    "storage",
    "browserSettings"
  ],
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "16": "icon16.png"
    },
    "default_title": "Zoom Page WE",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js",
      "publicsuffixlist.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "commands": {
    "_execute_browser_action": {
      "description": "Show Zoom Popup",
      "suggested_key": {
        "default": "Alt+Z"
      }
    }
  }
}