first commit

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"
+  ]
+}