Examine source code of Beautify some sites

{
  "description": "Beautify some sites",
  "manifest_version": 2,
  "name": "Beautify some sites",
  "version": "5.0.7",
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "background.js",
      "background_rules.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.1over1.net/*",
        "*://*.1over2.net/*"
      ],
      "css": [
        "CSS_1over1.css"
      ],
      "js": [
        "JS_1over1.js"
      ]
    },
    {
      "matches": [
        "*://*.cool18.com/*",
        "*://*.6parker.com/*",
        "*://*.toutiaoabc.com/*"
      ],
      "css": [
        "CSS_cool18.css"
      ],
      "js": [
        "JS_cool18.js"
      ]
    },
    {
      "matches": [
        "*://*.sex8.cc/*",
        "*://*.aitrug.space/*",
        "*://*.chengrena.site/*"
      ],
      "css": [
        "CSS_sex8.css"
      ],
      "js": [
        "JS_sex8.js"
      ]
    },
    {
      "matches": [
        "*://*.sexinsex.net/*",
        "*://*.sis.xxx/*",
        "*://*.sis001.com/*"
      ],
      "css": [
        "CSS_sis.css"
      ],
      "js": [
        "JS_sis.js"
      ]
    },
    {
      "matches": [
        "*://*.t66y.com/*"
      ],
      "css": [
        "CSS_t66y.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1b9c9867-653a-4696-ba3a-77004f7bc120}"
    }
  }
}