first commit

.gitignore

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+.env

README.md

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+# Figma Windows UA Spoofer (Chrome + Firefox)
+
+`figma.com` / `*.figma.com`에서만 User-Agent를 Windows로 바꾸고,
+페이지 JS의 `navigator.userAgent`, `navigator.platform`도 Windows 값으로 오버라이드합니다.
+
+## 빠른 사용
+
+### Chrome / Edge
+
+1. `chrome://extensions` (Edge: `edge://extensions`) 접속
+2. 개발자 모드 ON
+3. 압축해제된 확장 프로그램 로드
+4. 프로젝트 폴더 선택
+
+### Firefox unsigned 빌드
+
+```bash
+./build-firefox.sh
+```
+
+- 출력: `dist/figma-windows-ua-firefox-unsigned.xpi`
+- 개발/테스트용 unsigned 패키지
+
+### Firefox 서명 빌드 (실사용)
+
+1. AMO(Add-ons Mozilla)에서 API Key/Secret 발급
+2. `.env`에 값 저장 (자동 로드)
+
+```dotenv
+AMO_JWT_ISSUER="<your-api-key>"
+AMO_JWT_SECRET="<your-api-secret>"
+```
+
+3. Nix로 서명 실행 (추천)
+
+```bash
+nix run .#sign-firefox
+```
+
+- 출력: `dist/signed/*.xpi` (서명 완료)
+
+## Firefox 설치
+
+- 임시 로드: `about:debugging#/runtime/this-firefox` → 임시 부가 기능 로드 → `dist/firefox/manifest.json`
+- 실제 배포/설치: `dist/signed/*.xpi` 사용
+
+## 확인
+
+`figma.com`에서 콘솔 실행:
+
+```js
+navigator.userAgent
+navigator.platform
+navigator.userAgentData?.platform
+```
+
+Windows 계열 값이면 정상입니다.

background.firefox.js

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+const WINDOWS_UA = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.7444.163 Safari/537.36';
+
+browser.webRequest.onBeforeSendHeaders.addListener(
+  (details) => {
+    const headers = details.requestHeaders || [];
+    let found = false;
+
+    for (const header of headers) {
+      if (header.name && header.name.toLowerCase() === 'user-agent') {
+        header.value = WINDOWS_UA;
+        found = true;
+        break;
+      }
+    }
+
+    if (!found) {
+      headers.push({ name: 'User-Agent', value: WINDOWS_UA });
+    }
+
+    return { requestHeaders: headers };
+  },
+  {
+    urls: [
+      'https://figma.com/*',
+      'https://*.figma.com/*'
+    ]
+  },
+  ['blocking', 'requestHeaders']
+);

build-firefox.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+DIST_DIR="$ROOT_DIR/dist/firefox"
+XPI_PATH="$ROOT_DIR/dist/figma-windows-ua-firefox-unsigned.xpi"
+
+rm -rf "$DIST_DIR"
+mkdir -p "$DIST_DIR"
+
+rm -f "$ROOT_DIR/dist/figma-windows-ua-firefox.xpi"
+rm -f "$ROOT_DIR/dist/figma-windows-ua-firefox.zip"
+
+cp "$ROOT_DIR/manifest.firefox.json" "$DIST_DIR/manifest.json"
+cp "$ROOT_DIR/background.firefox.js" "$DIST_DIR/background.firefox.js"
+cp "$ROOT_DIR/content.js" "$DIST_DIR/content.js"
+cp "$ROOT_DIR/injected.js" "$DIST_DIR/injected.js"
+
+rm -f "$XPI_PATH"
+(
+  cd "$DIST_DIR"
+  zip -r "$XPI_PATH" .
+)
+
+echo "Firefox build created: $XPI_PATH"

content.js

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+(() => {
+  const script = document.createElement('script');
+  script.src = chrome.runtime.getURL('injected.js');
+  script.onload = () => script.remove();
+  (document.head || document.documentElement).appendChild(script);
+})();

dist/firefox/.amo-upload-uuid

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+{"uploadUuid":"b4b16a82abdb4ce5850b5d0deb76ef3b","channel":"unlisted","xpiCrcHash":"e5567d47cfb9f6133110396308a37ed42afc5be51f6b047ae4643d3f5f063591"}

dist/firefox/background.firefox.js

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+const WINDOWS_UA = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.7444.163 Safari/537.36';
+
+browser.webRequest.onBeforeSendHeaders.addListener(
+  (details) => {
+    const headers = details.requestHeaders || [];
+    let found = false;
+
+    for (const header of headers) {
+      if (header.name && header.name.toLowerCase() === 'user-agent') {
+        header.value = WINDOWS_UA;
+        found = true;
+        break;
+      }
+    }
+
+    if (!found) {
+      headers.push({ name: 'User-Agent', value: WINDOWS_UA });
+    }
+
+    return { requestHeaders: headers };
+  },
+  {
+    urls: [
+      'https://figma.com/*',
+      'https://*.figma.com/*'
+    ]
+  },
+  ['blocking', 'requestHeaders']
+);

dist/firefox/content.js

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+(() => {
+  const script = document.createElement('script');
+  script.src = chrome.runtime.getURL('injected.js');
+  script.onload = () => script.remove();
+  (document.head || document.documentElement).appendChild(script);
+})();

dist/firefox/injected.js

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+(() => {
+  const windowsUA = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.7444.163 Safari/537.36';
+  const appVersion = '5.0 (Windows)';
+
+  const override = (obj, key, value) => {
+    try {
+      Object.defineProperty(obj, key, {
+        get: () => value,
+        configurable: true
+      });
+    } catch (error) {
+      // no-op
+    }
+  };
+
+  override(Navigator.prototype, 'userAgent', windowsUA);
+  override(Navigator.prototype, 'appVersion', appVersion);
+  override(Navigator.prototype, 'platform', 'Win32');
+  override(Navigator.prototype, 'oscpu', 'Windows NT 10.0; Win64; x64');
+
+  if (navigator.userAgentData) {
+    const uaData = {
+      brands: [
+        { brand: 'Chromium', version: '142' },
+        { brand: 'Google Chrome', version: '142' }
+      ],
+      mobile: false,
+      platform: 'Windows',
+      getHighEntropyValues: async (hints) => {
+        const result = {
+          architecture: 'x86',
+          bitness: '64',
+          mobile: false,
+          model: '',
+          platform: 'Windows',
+          platformVersion: '10.0.0',
+          uaFullVersion: '142.0.7444.163',
+          wow64: false
+        };
+
+        if (Array.isArray(hints)) {
+          return hints.reduce((acc, hint) => {
+            if (hint in result) acc[hint] = result[hint];
+            return acc;
+          }, {});
+        }
+
+        return result;
+      },
+      toJSON: () => ({
+        brands: [
+          { brand: 'Chromium', version: '142' },
+          { brand: 'Google Chrome', version: '142' }
+        ],
+        mobile: false,
+        platform: 'Windows'
+      })
+    };
+
+    override(Navigator.prototype, 'userAgentData', uaData);
+  }
+})();

dist/firefox/manifest.json

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+{
+  "manifest_version": 2,
+  "name": "Figma Windows UA Spoofer",
+  "description": "Spoof Windows User-Agent and platform on figma.com",
+  "version": "1.0.0",
+  "applications": {
+    "gecko": {
+      "id": "figma-windows-ua-spoofer@imnyang.local",
+      "strict_min_version": "109.0"
+    }
+  },
+  "permissions": [
+    "webRequest",
+    "webRequestBlocking",
+    "https://figma.com/*",
+    "https://*.figma.com/*"
+  ],
+  "background": {
+    "scripts": [
+      "background.firefox.js"
+    ]
+  },
+  "content_scripts": [
+    {
+      "matches": [
+        "https://figma.com/*",
+        "https://*.figma.com/*"
+      ],
+      "js": [
+        "content.js"
+      ],
+      "run_at": "document_start"
+    }
+  ],
+  "web_accessible_resources": [
+    "injected.js"
+  ]
+}

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1772542754,
+        "narHash": "sha256-WGV2hy+VIeQsYXpsLjdr4GvHv5eECMISX1zKLTedhdg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "8c809a146a140c5c8806f13399592dbcb1bb5dc4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Figma Windows UA Spoofer - Firefox signing environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          packages = with pkgs; [
+            bash
+            zip
+            web-ext
+            nodejs
+          ];
+        };
+
+        apps.sign-firefox = {
+          type = "app";
+          program = toString (pkgs.writeShellScript "sign-firefox" ''
+            set -euo pipefail
+            exec ${pkgs.bash}/bin/bash ./sign-firefox.sh
+          '');
+        };
+      });
+}

injected.js

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+(() => {
+  const windowsUA = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.7444.163 Safari/537.36';
+  const appVersion = '5.0 (Windows)';
+
+  const override = (obj, key, value) => {
+    try {
+      Object.defineProperty(obj, key, {
+        get: () => value,
+        configurable: true
+      });
+    } catch (error) {
+      // no-op
+    }
+  };
+
+  override(Navigator.prototype, 'userAgent', windowsUA);
+  override(Navigator.prototype, 'appVersion', appVersion);
+  override(Navigator.prototype, 'platform', 'Win32');
+  override(Navigator.prototype, 'oscpu', 'Windows NT 10.0; Win64; x64');
+
+  if (navigator.userAgentData) {
+    const uaData = {
+      brands: [
+        { brand: 'Chromium', version: '142' },
+        { brand: 'Google Chrome', version: '142' }
+      ],
+      mobile: false,
+      platform: 'Windows',
+      getHighEntropyValues: async (hints) => {
+        const result = {
+          architecture: 'x86',
+          bitness: '64',
+          mobile: false,
+          model: '',
+          platform: 'Windows',
+          platformVersion: '10.0.0',
+          uaFullVersion: '142.0.7444.163',
+          wow64: false
+        };
+
+        if (Array.isArray(hints)) {
+          return hints.reduce((acc, hint) => {
+            if (hint in result) acc[hint] = result[hint];
+            return acc;
+          }, {});
+        }
+
+        return result;
+      },
+      toJSON: () => ({
+        brands: [
+          { brand: 'Chromium', version: '142' },
+          { brand: 'Google Chrome', version: '142' }
+        ],
+        mobile: false,
+        platform: 'Windows'
+      })
+    };
+
+    override(Navigator.prototype, 'userAgentData', uaData);
+  }
+})();

manifest.firefox.json

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+{
+  "manifest_version": 2,
+  "name": "Figma Windows UA Spoofer",
+  "description": "Spoof Windows User-Agent and platform on figma.com",
+  "version": "1.0.0",
+  "applications": {
+    "gecko": {
+      "id": "figma-windows-ua-spoofer@imnyang.local",
+      "strict_min_version": "109.0"
+    }
+  },
+  "permissions": [
+    "webRequest",
+    "webRequestBlocking",
+    "https://figma.com/*",
+    "https://*.figma.com/*"
+  ],
+  "background": {
+    "scripts": [
+      "background.firefox.js"
+    ]
+  },
+  "content_scripts": [
+    {
+      "matches": [
+        "https://figma.com/*",
+        "https://*.figma.com/*"
+      ],
+      "js": [
+        "content.js"
+      ],
+      "run_at": "document_start"
+    }
+  ],
+  "web_accessible_resources": [
+    "injected.js"
+  ]
+}

manifest.json

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+{
+  "manifest_version": 3,
+  "name": "Figma Windows UA Spoofer",
+  "description": "Spoof Windows User-Agent and platform on figma.com",
+  "version": "1.0.0",
+  "permissions": [
+    "declarativeNetRequest"
+  ],
+  "host_permissions": [
+    "https://figma.com/*",
+    "https://*.figma.com/*"
+  ],
+  "declarative_net_request": {
+    "rule_resources": [
+      {
+        "id": "ruleset_1",
+        "enabled": true,
+        "path": "rules.json"
+      }
+    ]
+  },
+  "content_scripts": [
+    {
+      "matches": [
+        "https://figma.com/*",
+        "https://*.figma.com/*"
+      ],
+      "js": [
+        "content.js"
+      ],
+      "run_at": "document_start"
+    }
+  ],
+  "web_accessible_resources": [
+    {
+      "resources": [
+        "injected.js"
+      ],
+      "matches": [
+        "https://figma.com/*",
+        "https://*.figma.com/*"
+      ]
+    }
+  ]
+}

rules.json

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+[
+  {
+    "id": 1,
+    "priority": 1,
+    "action": {
+      "type": "modifyHeaders",
+      "requestHeaders": [
+        {
+          "header": "User-Agent",
+          "operation": "set",
+          "value": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.7444.163 Safari/537.36"
+        }
+      ]
+    },
+    "condition": {
+      "regexFilter": "^https:\\/\\/([a-zA-Z0-9-]+\\.)*figma\\.com\\/",
+      "resourceTypes": [
+        "main_frame",
+        "sub_frame",
+        "xmlhttprequest",
+        "script",
+        "image",
+        "font",
+        "stylesheet",
+        "media",
+        "other"
+      ]
+    }
+  }
+]

sign-firefox.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SOURCE_DIR="$ROOT_DIR/dist/firefox"
+SIGNED_DIR="$ROOT_DIR/dist/signed"
+
+if [ -f "$ROOT_DIR/.env" ]; then
+  set -a
+  # shellcheck disable=SC1091
+  . "$ROOT_DIR/.env"
+  set +a
+fi
+
+if [ -z "${AMO_JWT_ISSUER:-}" ] || [ -z "${AMO_JWT_SECRET:-}" ]; then
+  echo "AMO_JWT_ISSUER / AMO_JWT_SECRET 값이 필요합니다."
+  echo "(.env 또는 환경변수에서 읽습니다)"
+  echo "예:"
+  echo "  export AMO_JWT_ISSUER=\"<your-api-key>\""
+  echo "  export AMO_JWT_SECRET=\"<your-api-secret>\""
+  exit 1
+fi
+
+"$ROOT_DIR/build-firefox.sh"
+mkdir -p "$SIGNED_DIR"
+
+if command -v web-ext >/dev/null 2>&1; then
+  web-ext sign \
+    --source-dir "$SOURCE_DIR" \
+    --artifacts-dir "$SIGNED_DIR" \
+    --api-key "$AMO_JWT_ISSUER" \
+    --api-secret "$AMO_JWT_SECRET" \
+    --channel unlisted
+elif command -v npx >/dev/null 2>&1; then
+  npx --yes web-ext sign \
+    --source-dir "$SOURCE_DIR" \
+    --artifacts-dir "$SIGNED_DIR" \
+    --api-key "$AMO_JWT_ISSUER" \
+    --api-secret "$AMO_JWT_SECRET" \
+    --channel unlisted
+else
+  echo "web-ext 또는 npx가 필요합니다."
+  echo "Nix 사용 시: nix develop -c ./sign-firefox.sh"
+  exit 1
+fi
+
+echo "Signed XPI generated under: $SIGNED_DIR"