Examine source code of mirigana

{
  "manifest_version": 2,
  "name": "mirigana",
  "version": "1.1.1",
  "default_locale": "en",
  "description": "__MSG_extension_description__",
  "icons": {
    "16": "icons/action-icon-16.png",
    "48": "icons/app-icon-48.png",
    "64": "icons/app-icon-64.png",
    "128": "icons/app-icon-128.png"
  },
  "background": {
    "scripts": [
      "vendors/kuromoji.js",
      "constants.js",
      "background/rules/rule-fix.js",
      "background/rules/rule-month.js",
      "background/rules/rule-date.js",
      "background/rules/rule-counter.js",
      "background/rules/rule-purify.js",
      "background/token-rules.js",
      "background/memory-cache.js",
      "background/background.js"
    ],
    "persistent": true
  },
  "page_action": {
    "default_icon": {
      "16": "icons/action-icon-16.png",
      "48": "icons/action-icon-48.png",
      "64": "icons/action-icon-64.png",
      "128": "icons/action-icon-128.png"
    },
    "default_popup": "components/popup/popup.html"
  },
  "options_ui": {
    "page": "components/options/options.html",
    "open_in_tab": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/*",
        "https://x.com/*"
      ],
      "js": [
        "constants.js",
        "content_scripts/console.js",
        "content_scripts/setting-storage.js",
        "content_scripts/common.js",
        "content_scripts/miri.js",
        "content_scripts/twitter.js"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cde2f82c-3312-444a-b544-c0b8a758cfb6}",
      "strict_min_version": "70.0"
    }
  }
}