Examine source code of SeoQuake SEO extension

{
  "name": "__MSG_extName__",
  "version": "3.9.9",
  "manifest_version": 2,
  "description": "__MSG_extDescription__",
  "short_name": "SEOquake",
  "icons": {
    "16": "static/icon_16x16.png",
    "48": "static/logo_48x48.png",
    "96": "static/logo_96x96.png",
    "128": "static/logo_128x128.png"
  },
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "{317B5128-0B0B-49b2-B2DB-1E7560E16C74}",
      "strict_min_version": "52.0"
    }
  },
  "browser_action": {
    "default_icon": {
      "19": "static/icon-disabled19.png",
      "38": "static/icon-disabled38.png"
    },
    "default_title": "SEOquake",
    "default_popup": "panel.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "css": [
        "plugins.css"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "exclude_matches": [
        "*://*.facebook.com/*",
        "*://*.facebook.net/*",
        "*://*.fbcdn.net/*",
        "*://*.akamaihd.net/*",
        "*://*.virtualearth.net/*"
      ],
      "js": [
        "data/plugins.js"
      ],
      "all_frames": false
    },
    {
      "matches": [
        "http://ipv4.google.com/sorry/IndexRedirect*",
        "https://ipv4.google.com/sorry/IndexRedirect*",
        "http://ipv4.google.com/sorry/index*",
        "https://ipv4.google.com/sorry/index*",
        "*://*.yandex.ru/showcaptcha*",
        "*://yandex.ru/showcaptcha*",
        "*://*.yandex.ua/showcaptcha*",
        "*://yandex.ua/showcaptcha*",
        "*://*.yandex.by/showcaptcha*",
        "*://yandex.by/showcaptcha*",
        "*://*.yandex.kz/showcaptcha*",
        "*://yandex.kz/showcaptcha*",
        "*://*.yandex.com/showcaptcha*",
        "*://yandex.com/showcaptcha*",
        "*://*.yandex.com.tr/showcaptcha*",
        "*://yandex.com.tr/showcaptcha*"
      ],
      "js": [
        "data/captcha.js"
      ],
      "css": [
        "captcha.css"
      ]
    },
    {
      "matches": [
        "https://oauth.semrush.com/oauth2/success*"
      ],
      "js": [
        "data/oauth.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true,
    "browser_style": false
  },
  "permissions": [
    "contextMenus",
    "tabs",
    "storage",
    "downloads",
    "http://*/*",
    "https://*/*",
    "https://www.seoquake.com/"
  ],
  "web_accessible_resources": [
    "/static/fonts/*",
    "/static/icons/*",
    "/static/svg/*"
  ]
}