ext: MV3 manifest + esbuild build; drop polyfill for Firefox's browser global

Firefox-only extension, so webextension-polyfill (a Chrome shim) is dead
weight and forces a bundler just to resolve one bare import. Use the native
`browser.*` global with @types/firefox-webext-browser instead.

  - manifest.json: MV3, event-page background (dist/background.js), the
    docs/05 §7 permission set (<all_urls> in host_permissions),
    strict_min_version 128.0, data_collection_permissions none.
  - scripts/build.mjs: esbuild bundle of src/background/index.ts -> dist/,
    esm, target firefox128. Wired to `prepare` so `npm ci` produces the
    bundle and CI's `web-ext lint` (which needs it to exist) passes with no
    added CI step. dist/ stays gitignored.
  - src/background/index.ts: event-page entry — brings the transport up,
    holds the shared reference. Capture surfaces attach here next.
  - transport/storage.ts, transport/index.ts: use the browser global.
  - tests/setup.ts: stub the browser global instead of mocking a module.

web-ext lint clean (0/0/0). typecheck clean. 38 tests still green.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_012Y9RU58hD1BuwP82DySUHk

extension/manifest.json

@@ -0,0 +1,34 @@
+{
+  "manifest_version": 3,
+  "name": "Velox",
+  "version": "0.1.0",
+  "description": "Hands Firefox downloads to the Velox download manager. Collects the URL, headers and cookies; the daemon does the rest.",
+
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "[email protected]",
+      "strict_min_version": "128.0",
+      "data_collection_permissions": {
+        "required": ["none"]
+      }
+    }
+  },
+
+  "background": {
+    "scripts": ["dist/background.js"],
+    "type": "module"
+  },
+
+  "permissions": [
+    "webRequest",
+    "webRequestBlocking",
+    "downloads",
+    "cookies",
+    "contextMenus",
+    "storage",
+    "notifications",
+    "nativeMessaging"
+  ],
+
+  "host_permissions": ["<all_urls>"]
+}

extension/package-lock.json

@@ -7,12 +7,10 @@
     "": {
       "name": "@velox/extension",
       "version": "0.0.0",
-      "dependencies": {
-        "webextension-polyfill": "^0.12.0"
-      },
       "devDependencies": {
-        "@types/webextension-polyfill": "^0.12.1",
+        "@types/firefox-webext-browser": "^120.0.4",
         "@types/ws": "^8.5.12",
+        "esbuild": "^0.24.0",
         "typescript": "^5.6.0",
         "vitest": "^2.1.0",
         "web-ext": "^8.3.0",
@@ -103,19 +101,404 @@
         }
       }
     },
-    "node_modules/@esbuild/linux-x64": {
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+      ],
+      "engines": {
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+      }
+    },
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       "cpu": [
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       "dev": true,
-      "license": "MIT",
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+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "sunos"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-arm64": {
+      "version": "0.24.2",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-ia32": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.24.2.tgz",
+      "integrity": "sha512-q+iGUwfs8tncmFC9pcnD5IvRHAzmbwQ3GPS5/ceCyHdjXubwQWI12MKWSNSMYLJMq23/IUCvJMS76PDqXe1fxA==",
+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-x64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.24.2.tgz",
+      "integrity": "sha512-7VTgWzgMGvup6aSqDPLiW5zHaxYJGTO4OokMjIlrCtf+VpEL+cXKtCvg723iguPYI5oaUNdS+/V7OU2gvXVWEg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
       }
     },
     "node_modules/@eslint-community/eslint-utils": {
@@ -412,6 +795,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/firefox-webext-browser": {
+      "version": "120.0.5",
+      "resolved": "https://registry.npmjs.org/@types/firefox-webext-browser/-/firefox-webext-browser-120.0.5.tgz",
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+      "dev": true
+    },
     "node_modules/@types/minimatch": {
       "version": "3.0.5",
       "dev": true,
@@ -425,11 +814,6 @@
         "undici-types": "~6.21.0"
       }
     },
-    "node_modules/@types/webextension-polyfill": {
-      "version": "0.12.6",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/@types/ws": {
       "version": "8.18.1",
       "resolved": "https://registry.npmjs.org/@types/ws/-/ws-8.18.1.tgz",
@@ -1429,40 +1813,43 @@
       "license": "MIT"
     },
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-      "version": "0.21.5",
+      "version": "0.24.2",
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       "dev": true,
       "hasInstallScript": true,
-      "license": "MIT",
       "bin": {
         "esbuild": "bin/esbuild"
       },
       "engines": {
-        "node": ">=12"
+        "node": ">=18"
       },
       "optionalDependencies": {
-        "@esbuild/aix-ppc64": "0.21.5",
+        "@esbuild/aix-ppc64": "0.24.2",
-        "@esbuild/android-arm": "0.21.5",
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-        "@esbuild/android-arm64": "0.21.5",
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+        "@esbuild/android-x64": "0.24.2",
-        "@esbuild/darwin-arm64": "0.21.5",
+        "@esbuild/darwin-arm64": "0.24.2",
-        "@esbuild/darwin-x64": "0.21.5",
+        "@esbuild/darwin-x64": "0.24.2",
-        "@esbuild/freebsd-arm64": "0.21.5",
+        "@esbuild/freebsd-arm64": "0.24.2",
-        "@esbuild/freebsd-x64": "0.21.5",
+        "@esbuild/freebsd-x64": "0.24.2",
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+        "@esbuild/linux-arm": "0.24.2",
-        "@esbuild/linux-arm64": "0.21.5",
+        "@esbuild/linux-arm64": "0.24.2",
-        "@esbuild/linux-ia32": "0.21.5",
+        "@esbuild/linux-ia32": "0.24.2",
-        "@esbuild/linux-loong64": "0.21.5",
+        "@esbuild/linux-loong64": "0.24.2",
-        "@esbuild/linux-mips64el": "0.21.5",
+        "@esbuild/linux-mips64el": "0.24.2",
-        "@esbuild/linux-ppc64": "0.21.5",
+        "@esbuild/linux-ppc64": "0.24.2",
-        "@esbuild/linux-riscv64": "0.21.5",
+        "@esbuild/linux-riscv64": "0.24.2",
-        "@esbuild/linux-s390x": "0.21.5",
+        "@esbuild/linux-s390x": "0.24.2",
-        "@esbuild/linux-x64": "0.21.5",
+        "@esbuild/linux-x64": "0.24.2",
-        "@esbuild/netbsd-x64": "0.21.5",
+        "@esbuild/netbsd-arm64": "0.24.2",
-        "@esbuild/openbsd-x64": "0.21.5",
+        "@esbuild/netbsd-x64": "0.24.2",
-        "@esbuild/sunos-x64": "0.21.5",
+        "@esbuild/openbsd-arm64": "0.24.2",
-        "@esbuild/win32-arm64": "0.21.5",
+        "@esbuild/openbsd-x64": "0.24.2",
-        "@esbuild/win32-ia32": "0.21.5",
+        "@esbuild/sunos-x64": "0.24.2",
-        "@esbuild/win32-x64": "0.21.5"
+        "@esbuild/win32-arm64": "0.24.2",
+        "@esbuild/win32-ia32": "0.24.2",
+        "@esbuild/win32-x64": "0.24.2"
       }
     },
     "node_modules/escalade": {
@@ -1859,6 +2246,20 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/fsevents": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
+      "integrity": "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==",
+      "dev": true,
+      "hasInstallScript": true,
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
     "node_modules/fx-runner": {
       "version": "1.4.0",
       "dev": true,
@@ -3697,6 +4098,412 @@
         "url": "https://opencollective.com/vitest"
       }
     },
+    "node_modules/vite/node_modules/@esbuild/aix-ppc64": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.21.5.tgz",
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+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/vite/node_modules/@esbuild/android-arm": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.21.5.tgz",
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+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/vite/node_modules/@esbuild/android-arm64": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.21.5.tgz",
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+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.21.5.tgz",
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+      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.21.5.tgz",
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+      "optional": true,
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+      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.21.5.tgz",
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+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.21.5.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/vite/node_modules/esbuild": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.21.5.tgz",
+      "integrity": "sha512-mg3OPMV4hXywwpoDxu3Qda5xCKQi+vCTZq8S9J/EpkhB2HzKXq4SNFZE3+NK93JYxc8VMSep+lOUSC/RVKaBqw==",
+      "dev": true,
+      "hasInstallScript": true,
+      "bin": {
+        "esbuild": "bin/esbuild"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "optionalDependencies": {
+        "@esbuild/aix-ppc64": "0.21.5",
+        "@esbuild/android-arm": "0.21.5",
+        "@esbuild/android-arm64": "0.21.5",
+        "@esbuild/android-x64": "0.21.5",
+        "@esbuild/darwin-arm64": "0.21.5",
+        "@esbuild/darwin-x64": "0.21.5",
+        "@esbuild/freebsd-arm64": "0.21.5",
+        "@esbuild/freebsd-x64": "0.21.5",
+        "@esbuild/linux-arm": "0.21.5",
+        "@esbuild/linux-arm64": "0.21.5",
+        "@esbuild/linux-ia32": "0.21.5",
+        "@esbuild/linux-loong64": "0.21.5",
+        "@esbuild/linux-mips64el": "0.21.5",
+        "@esbuild/linux-ppc64": "0.21.5",
+        "@esbuild/linux-riscv64": "0.21.5",
+        "@esbuild/linux-s390x": "0.21.5",
+        "@esbuild/linux-x64": "0.21.5",
+        "@esbuild/netbsd-x64": "0.21.5",
+        "@esbuild/openbsd-x64": "0.21.5",
+        "@esbuild/sunos-x64": "0.21.5",
+        "@esbuild/win32-arm64": "0.21.5",
+        "@esbuild/win32-ia32": "0.21.5",
+        "@esbuild/win32-x64": "0.21.5"
+      }
+    },
     "node_modules/vitest": {
       "version": "2.1.9",
       "dev": true,
@@ -3822,10 +4629,6 @@
         "npm": ">=8.0.0"
       }
     },
-    "node_modules/webextension-polyfill": {
-      "version": "0.12.0",
-      "license": "MPL-2.0"
-    },
     "node_modules/when": {
       "version": "3.7.7",
       "dev": true,

extension/package.json

@@ -5,17 +5,17 @@
   "description": "Velox Firefox extension (lane EXT). Collects URL + headers + cookies and hands downloads to veloxd; renders daemon state. Zero download logic.",
   "type": "module",
   "scripts": {
+    "build": "node scripts/build.mjs",
+    "prepare": "node scripts/build.mjs",
     "typecheck": "tsc --noEmit",
     "test": "vitest run",
     "test:watch": "vitest",
     "lint": "web-ext lint --source-dir ."
   },
-  "dependencies": {
-    "webextension-polyfill": "^0.12.0"
-  },
   "devDependencies": {
-    "@types/webextension-polyfill": "^0.12.1",
+    "@types/firefox-webext-browser": "^120.0.4",
     "@types/ws": "^8.5.12",
+    "esbuild": "^0.24.0",
     "typescript": "^5.6.0",
     "vitest": "^2.1.0",
     "web-ext": "^8.3.0",

extension/scripts/build.mjs

@@ -0,0 +1,46 @@
+// Bundles the extension's TypeScript entry points into dist/ for Firefox to load.
+//
+// Runs on `npm run build` and, via the `prepare` script, on every `npm ci` — so CI's
+// `web-ext lint` (which needs the referenced bundles to exist) works without a separate
+// build step. Firefox-only: no polyfill, native ESM, `browser.*` is a global.
+
+import { build } from 'esbuild';
+import { rm, mkdir } from 'node:fs/promises';
+import { fileURLToPath } from 'node:url';
+import { dirname, resolve } from 'node:path';
+
+const root = resolve(dirname(fileURLToPath(import.meta.url)), '..');
+const outdir = resolve(root, 'dist');
+
+// One entry per manifest surface. Add popup/options/content here as they land.
+const entryPoints = {
+  background: resolve(root, 'src/background/index.ts'),
+};
+
+await rm(outdir, { recursive: true, force: true });
+await mkdir(outdir, { recursive: true });
+
+const watch = process.argv.includes('--watch');
+const dev = watch || process.argv.includes('--dev');
+
+const options = {
+  entryPoints,
+  outdir,
+  bundle: true,
+  format: 'esm',
+  target: ['firefox128'],
+  platform: 'browser',
+  sourcemap: dev ? 'inline' : 'linked',
+  minify: !dev,
+  logLevel: 'info',
+  // A bare `import ... from 'ws'` etc. must never reach a bundle — fail loud if one does.
+  external: [],
+};
+
+if (watch) {
+  const ctx = await (await import('esbuild')).context(options);
+  await ctx.watch();
+  console.log('esbuild: watching');
+} else {
+  await build(options);
+}

extension/src/background/index.ts

@@ -0,0 +1,26 @@
+// Background event-page entry.
+//
+// Brings the transport up and holds the single shared reference to it. Capture, the
+// popup relay, and context menus attach here as they land (docs/05 §6 build order).
+
+import { createTransport, type TransportStatus, type VeloxTransport } from './transport/index.js';
+
+let transport: VeloxTransport | undefined;
+
+function onTransportState(status: TransportStatus): void {
+  const detail = status.fatal ?? (status.needsPairing ? 'needs pairing' : '');
+  console.debug(`[velox] transport ${status.state}${detail ? ` — ${detail}` : ''}`);
+}
+
+async function start(): Promise<void> {
+  transport = await createTransport();
+  transport.onStateChange(onTransportState);
+  onTransportState(transport.status);
+}
+
+void start();
+
+/** Exposed for the surfaces wired in later steps of the build order. */
+export function getTransport(): VeloxTransport | undefined {
+  return transport;
+}

extension/src/background/transport/index.ts

@@ -4,8 +4,6 @@
 // upgrade that is only taken when its handshake actually succeeds, never on detection
 // alone. The user can force one from Options (the override, persisted in storage).
 
-import browser from 'webextension-polyfill';
-
 import type { BackoffOptions } from './backoff.js';
 import { WS_PORT_RANGE, type PortRange } from './discovery.js';
 import { NativeTransport, type ConnectNative } from './native.js';
@@ -60,7 +58,7 @@ function wsDeps(opts: CreateTransportOptions): WebSocketTransportDeps {
 
 function nativeDeps(opts: CreateTransportOptions): ConstructorParameters<typeof NativeTransport>[0] {
   const connectNative =
-    opts.connectNative ?? (browser.runtime.connectNative.bind(browser.runtime) as ConnectNative);
+    opts.connectNative ?? (browser.runtime.connectNative.bind(browser.runtime) as unknown as ConnectNative);
   return opts.backoff ? { connectNative, backoff: opts.backoff } : { connectNative };
 }
 

extension/src/background/transport/storage.ts

@@ -1,8 +1,8 @@
 // The few pieces of transport state that must survive a browser restart:
 // the pairing token, the user's manual transport override, and a hint of which
 // WebSocket port worked last time so the next scan starts there.
-
+//
-import browser from 'webextension-polyfill';
+// Firefox exposes a promise-based `browser.*` natively, so there is no polyfill import.
 
 import type { TransportKind } from './types.js';
 

extension/tests/setup.ts

@@ -1,9 +1,9 @@
-// Global test setup: a mock of `webextension-polyfill` with an in-memory
+// Global test setup: a minimal stand-in for Firefox's `browser` global with an
-// storage.local, so storage.ts and the transport picker run without a browser.
+// in-memory storage.local, so storage.ts and the transport picker run under vitest.
 
-import { beforeEach, vi } from 'vitest';
+import { beforeEach } from 'vitest';
 
-vi.mock('webextension-polyfill', () => {
+function makeBrowserShim() {
   const store = new Map<string, unknown>();
   const local = {
     get: async (keys?: string | string[] | Record<string, unknown> | null) => {
@@ -25,20 +25,19 @@ vi.mock('webextension-polyfill', () => {
     },
   };
   return {
-    default: {
     storage: { local },
     runtime: {
-        getURL: (path = '/') =>
+      getURL: (path = '/') => `moz-extension://11111111-2222-3333-4444-555555555555${path}`,
-          `moz-extension://11111111-2222-3333-4444-555555555555${path}`,
       connectNative: () => {
         throw new Error('browser.runtime.connectNative was not stubbed for this test');
       },
     },
-    },
   };
-});
+}
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+(globalThis as any).browser = makeBrowserShim();
 
 beforeEach(async () => {
-  const browser = (await import('webextension-polyfill')).default;
   await browser.storage.local.clear();
 });

extension/tests/transport/index.test.ts

@@ -1,6 +1,5 @@
 import { afterEach, describe, expect, it } from 'vitest';
 import { WebSocket as WsClient } from 'ws';
-import browser from 'webextension-polyfill';
 
 import { createTransport } from '../../src/background/transport/index.js';
 import type { WebSocketCtor } from '../../src/background/transport/websocket.js';

extension/tsconfig.json

@@ -13,7 +13,7 @@
     "verbatimModuleSyntax": true,
     "noEmit": true,
     "skipLibCheck": true,
-    "types": ["node"]
+    "types": ["node", "firefox-webext-browser"]
   },
   "include": ["src/**/*.ts", "tests/**/*.ts"]
 }