Examine source code of gohei-mochi

{
  "manifest_version": 2,
  "name": "gohei-mochi",
  "version": "1.3.2resigned1",
  "description": "WebExtension to make futaba(2chan.net) life so-so good",
  "permissions": [
    "*://*/*",
    "clipboardRead",
    "tabs",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "background/gohei-mochi.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.2chan.net/*"
      ],
      "js": [
        "content-scripts/gohei-mochi.js"
      ],
      "css": [
        "content-scripts/normalize.css",
        "content-scripts/gohei-mochi.css"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "resources/js-error-preventer.js",
    "resources/images/feather/*.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{097c07db-8ce5-4b79-b530-45e5efd8324e}"
    }
  }
}