Examine source code of bilimap

{
  "name": "bilimap",
  "version": "1.4.2",
  "manifest_version": 3,
  "description": "在B站视频页面生成弹幕图表, 展示符合特定规则的弹幕在某一时刻的数量。",
  "icons": {
    "128": "icon/icon.png"
  },
  "action": {
    "default_icon": "icon/icon.png",
    "default_title": "bilimap",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.bilibili.com/video*",
        "https://*.bilibili.com/bangumi*"
      ],
      "js": [
        "content/bignumber.js",
        "content/echarts.min.js",
        "content/func.js",
        "content/main.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "https://*.bilibili.com/video*",
        "https://*.bilibili.com/bangumi*"
      ],
      "js": [
        "content/regvideoevent.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "page/pagevideoinfo.js",
        "page/pagevideoaction.js"
      ],
      "matches": [
        "https://*.bilibili.com/*"
      ]
    }
  ],
  "omnibox": {
    "keyword": "bav"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "downloads",
    "scripting",
    "storage",
    "tabs",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "https://*.bilibili.com/*"
  ],
  "externally_connectable": {
    "matches": [
      "*://*.bilibili.com/*"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "nightstream@foxmail.com"
    }
  },
  "homepage_url": "https://github.com/nightstream/bilimap"
}