Examine source code of Extension source viewer

{
  "name": "Extension source viewer",
  "description": "View source code of Firefox addons and Chrome extensions (crx/nex/xpi) from addons.mozilla.org, the Chrome Webstore and elsewhere.",
  "version": "1.7.0",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "52.0",
      "id": "crxviewer-firefox@robwu.nl"
    }
  },
  "background": {
    "scripts": [
      "storage-sync-polyfill.js",
      "chrome-platform-info.js",
      "cws_pattern.js",
      "background.js",
      "bg-contextmenu.js"
    ],
    "persistent": false
  },
  "page_action": {
    "default_icon": {
      "19": "icons/19.png",
      "38": "icons/38.png"
    },
    "default_title": "Inspect contents of the current browser extension",
    "default_popup": "popup.html",
    "show_matches": [
      "*://chrome.google.com/webstore/detail/*",
      "*://chromewebstore.google.com/detail/*",
      "*://microsoftedge.microsoft.com/addons/detail/*",
      "*://addons.opera.com/*extensions/details/*",
      "*://addons.mozilla.org/*addon/*",
      "*://*.addons.mozilla.org/*review/*",
      "*://addons.allizom.org/*addon/*",
      "*://*.addons.allizom.org/*review/*",
      "*://addons-dev.allizom.org/*addon/*",
      "*://*.addons-dev.allizom.org/*review/*",
      "*://addons.thunderbird.net/*addon/*",
      "*://addons-stage.thunderbird.net/*addon/*"
    ]
  },
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "options_ui": {
    "page": "options.html#optionsV2"
  },
  "permissions": [
    "tabs",
    "storage",
    "contextMenus",
    "downloads",
    "alarms",
    "cookies",
    "webRequest",
    "webRequestBlocking",
    "*://*/*"
  ]
}