Examine source code of SteamDB

{
  "manifest_version": 3,
  "version": "4.34",
  "author": "SteamDB",
  "name": "SteamDB",
  "short_name": "SteamDB",
  "description": "__MSG_extension_description__",
  "default_locale": "en",
  "homepage_url": "https://steamdb.info/",
  "options_ui": {
    "open_in_tab": true,
    "page": "options/options.html"
  },
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "64": "icons/64.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://steamdb.info/*",
    "https://steamcommunity.com/*",
    "https://*.steampowered.com/*"
  ],
  "action": {
    "default_popup": "options/popup.html"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox-extension@steamdb.info",
      "strict_min_version": "128.0"
    },
    "gecko_android": {
      "strict_min_version": "128.0"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "options/options.html",
        "icons/white.svg",
        "icons/pcgamingwiki.svg",
        "icons/steamhunters.svg",
        "icons/image.svg",
        "icons/achievements_completed.svg",
        "styles/appicon.css",
        "styles/inventory-sidebar.css",
        "scripts/community/inventory.js",
        "scripts/community/agecheck_injected.js",
        "scripts/community/filedetails_award_injected.js",
        "scripts/community/profile_award_injected.js",
        "scripts/community/tradeoffer_injected.js",
        "scripts/community/boostercreator_injected.js",
        "scripts/store/app_collapse_long_strings.js",
        "scripts/store/invalidate_cache_injected.js",
        "scripts/store/registerkey_injected.js",
        "scripts/store/subscriptions.js"
      ],
      "matches": [
        "https://store.steampowered.com/*",
        "https://steamcommunity.com/*"
      ]
    },
    {
      "resources": [
        "options/options.html"
      ],
      "matches": [
        "https://steamdb.info/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "https://steamdb.info/*"
      ],
      "exclude_matches": [
        "https://steamdb.info/api/*",
        "https://steamdb.info/static/*",
        "https://steamdb.info/embed/*"
      ],
      "js": [
        "scripts/common.js",
        "scripts/steamdb/global.js"
      ]
    },
    {
      "run_at": "document_start",
      "all_frames": true,
      "matches": [
        "https://store.steampowered.com/*",
        "https://steamcommunity.com/*"
      ],
      "js": [
        "scripts/common.js"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "https://store.steampowered.com/*"
      ],
      "exclude_matches": [
        "https://store.steampowered.com/account/ackgift/*",
        "https://store.steampowered.com/account/redeemwalletcode/*",
        "https://store.steampowered.com/actions/*",
        "https://store.steampowered.com/api/*",
        "https://store.steampowered.com/broadcast/*",
        "https://store.steampowered.com/buyitem/*",
        "https://store.steampowered.com/dynamicstore/*",
        "https://store.steampowered.com/join/*",
        "https://store.steampowered.com/login/*",
        "https://store.steampowered.com/public/*",
        "https://store.steampowered.com/saleaction/*",
        "https://store.steampowered.com/supportmessages/*",
        "https://store.steampowered.com/videos/*",
        "https://store.steampowered.com/vtt/*",
        "https://store.steampowered.com/widget/*"
      ],
      "js": [
        "scripts/global.js",
        "scripts/store/invalidate_cache.js"
      ],
      "css": [
        "styles/global.css",
        "styles/store.css"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "https://store.steampowered.com/app/*"
      ],
      "js": [
        "scripts/store/app_error.js",
        "scripts/store/app.js"
      ],
      "css": [
        "styles/store.css"
      ]
    },
    {
      "matches": [
        "https://store.steampowered.com/news/app/*"
      ],
      "js": [
        "scripts/store/app_error.js",
        "scripts/store/app_news.js"
      ],
      "css": [
        "styles/store.css"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "https://store.steampowered.com/app/*"
      ],
      "js": [
        "scripts/store/app_images.js"
      ]
    },
    {
      "run_at": "document_start",
      "matches": [
        "https://store.steampowered.com/account/licenses*"
      ],
      "js": [
        "scripts/store/account_licenses.js"
      ],
      "css": [
        "styles/account_licenses.css"
      ]
    },
    {
      "run_at": "document_start",
      "world": "MAIN",
      "matches": [
        "https://store.steampowered.com/account/licenses*"
      ],
      "js": [
        "scripts/store/account_licenses_injected.js"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "https://store.steampowered.com/account/registerkey*"
      ],
      "js": [
        "scripts/store/registerkey.js"
      ],
      "css": [
        "styles/store.css"
      ]
    },
    {
      "matches": [
        "https://store.steampowered.com/sub/*"
      ],
      "js": [
        "scripts/store/sub.js"
      ],
      "css": [
        "styles/store.css"
      ]
    },
    {
      "matches": [
        "https://store.steampowered.com/bundle/*"
      ],
      "js": [
        "scripts/store/bundle.js"
      ]
    },
    {
      "all_frames": true,
      "matches": [
        "https://store.steampowered.com/widget/*"
      ],
      "js": [
        "scripts/store/widget.js"
      ],
      "css": [
        "styles/store.css"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "https://store.steampowered.com/app/*/agecheck",
        "https://store.steampowered.com/agecheck/*"
      ],
      "js": [
        "scripts/store/app_error.js",
        "scripts/store/agecheck.js"
      ]
    },
    {
      "matches": [
        "https://store.steampowered.com/explore*"
      ],
      "js": [
        "scripts/store/explore.js"
      ]
    },
    {
      "run_at": "document_start",
      "matches": [
        "https://store.steampowered.com/app/*",
        "https://steamcommunity.com/app/*",
        "https://steamcommunity.com/sharedfiles/filedetails*",
        "https://steamcommunity.com/workshop/filedetails*",
        "https://steamcommunity.com/workshop/browse*",
        "https://steamcommunity.com/workshop/discussions*"
      ],
      "js": [
        "scripts/appicon.js"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "https://steamcommunity.com/*"
      ],
      "exclude_matches": [
        "https://steamcommunity.com/actions/*",
        "https://steamcommunity.com/chat/*",
        "https://steamcommunity.com/login/*",
        "https://steamcommunity.com/miniprofile/*",
        "https://steamcommunity.com/public/*",
        "https://steamcommunity.com/openid/*"
      ],
      "js": [
        "scripts/global.js"
      ],
      "css": [
        "styles/global.css"
      ]
    },
    {
      "matches": [
        "https://steamcommunity.com/id/*",
        "https://steamcommunity.com/profiles/*"
      ],
      "js": [
        "scripts/community/profile.js"
      ],
      "css": [
        "styles/community.css"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "https://steamcommunity.com/id/*/inventory*",
        "https://steamcommunity.com/profiles/*/inventory*"
      ],
      "js": [
        "scripts/community/profile_inventory.js"
      ],
      "css": [
        "styles/inventory.css"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "https://steamcommunity.com/id/*/stats*",
        "https://steamcommunity.com/profiles/*/stats*"
      ],
      "js": [
        "scripts/community/achievements.js",
        "scripts/community/achievements_profile.js"
      ],
      "css": [
        "styles/achievements.css"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "https://steamcommunity.com/id/*/stats/CSGO*",
        "https://steamcommunity.com/profiles/*/stats/CSGO*"
      ],
      "js": [
        "scripts/community/achievements_cs2.js"
      ],
      "css": [
        "styles/achievements_cs2.css"
      ]
    },
    {
      "matches": [
        "https://steamcommunity.com/stats/*/achievements*"
      ],
      "js": [
        "scripts/community/achievements.js",
        "scripts/community/achievements_global.js"
      ],
      "css": [
        "styles/community.css",
        "styles/achievements.css"
      ]
    },
    {
      "matches": [
        "https://steamcommunity.com/tradeoffer/*"
      ],
      "exclude_matches": [
        "https://steamcommunity.com/tradeoffer/*/confirm*"
      ],
      "js": [
        "scripts/community/tradeoffer.js"
      ]
    },
    {
      "matches": [
        "https://steamcommunity.com/id/*/recommended/*",
        "https://steamcommunity.com/profiles/*/recommended/*"
      ],
      "js": [
        "scripts/community/profile_recommended.js"
      ],
      "css": [
        "styles/community.css"
      ]
    },
    {
      "matches": [
        "https://steamcommunity.com/id/*/badges*",
        "https://steamcommunity.com/profiles/*/badges*"
      ],
      "js": [
        "scripts/community/profile_badges.js"
      ],
      "css": [
        "styles/community.css"
      ]
    },
    {
      "matches": [
        "https://steamcommunity.com/id/*/gamecards/*",
        "https://steamcommunity.com/profiles/*/gamecards/*"
      ],
      "js": [
        "scripts/community/profile_gamecards.js"
      ],
      "css": [
        "styles/community.css"
      ]
    },
    {
      "matches": [
        "https://steamcommunity.com/app/*",
        "https://steamcommunity.com/sharedfiles/filedetails*",
        "https://steamcommunity.com/workshop/filedetails*",
        "https://steamcommunity.com/workshop/browse*",
        "https://steamcommunity.com/workshop/discussions*"
      ],
      "js": [
        "scripts/community/gamehub.js"
      ],
      "css": [
        "styles/community.css"
      ]
    },
    {
      "matches": [
        "https://steamcommunity.com/sharedfiles/filedetails*",
        "https://steamcommunity.com/workshop/filedetails*"
      ],
      "js": [
        "scripts/community/filedetails.js"
      ]
    },
    {
      "all_frames": true,
      "matches": [
        "https://steamcommunity.com/sharedfiles/filedetails*",
        "https://steamcommunity.com/workshop/filedetails*"
      ],
      "js": [
        "scripts/community/filedetails_guide.js"
      ]
    },
    {
      "run_at": "document_end",
      "world": "MAIN",
      "matches": [
        "https://steamcommunity.com/market/multibuy*"
      ],
      "js": [
        "scripts/community/multibuy_injected.js"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "https://steamcommunity.com/app/*",
        "https://steamcommunity.com/games/*",
        "https://steamcommunity.com/sharedfiles/*",
        "https://steamcommunity.com/workshop/*"
      ],
      "js": [
        "scripts/community/agecheck.js"
      ]
    },
    {
      "run_at": "document_start",
      "matches": [
        "https://steamcommunity.com/linkfilter/*"
      ],
      "js": [
        "scripts/community/linkfilter.js"
      ]
    },
    {
      "all_frames": true,
      "matches": [
        "https://steamcommunity.com/market/*",
        "https://steamcommunity.com/id/*/inventory*",
        "https://steamcommunity.com/profiles/*/inventory*"
      ],
      "js": [
        "scripts/community/market_ssa.js"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "https://steamcommunity.com/tradingcards/boostercreator*"
      ],
      "js": [
        "scripts/community/boostercreator.js"
      ],
      "css": [
        "styles/boostercreator.css"
      ]
    }
  ]
}