feat: add Firefox build target

Firefox MV3 manifest with background scripts (not service worker),
popup-based UI, and gecko extension ID. Builds to distros/firefox/
with zip for AMO upload.

- New: src/firefox-manifest.json
- New: npm run build:firefox / build:firefox:prod
- Updated: build:all now includes Firefox
- Minimum Firefox version: 109.0

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: vveerrgg

build.js

@@ -11,6 +11,7 @@ const target = process.argv[3] || 'safari'; // safari | chrome | all
 const SRC = './src';
 const SAFARI_DIST = './distros/safari';
 const CHROME_DIST = './distros/chrome';
+const FIREFOX_DIST = './distros/firefox';
 
 const entryPoints = {
     'background.build': `${SRC}/background.js`,
@@ -178,6 +179,33 @@ async function buildChrome(opts = {}) {
     console.log(`Chrome zip → ./distros/${zipName}`);
 }
 
+// ---------------------------------------------------------------------------
+// Firefox build — bundles to distros/firefox/ with the Firefox manifest
+// ---------------------------------------------------------------------------
+async function buildFirefox(opts = {}) {
+    await esbuild.build({
+        ...shared,
+        ...opts,
+        entryPoints,
+        outdir: FIREFOX_DIST,
+    });
+
+    copyStaticAssets(FIREFOX_DIST);
+
+    // Firefox-specific manifest
+    fs.copyFileSync(path.join(SRC, 'firefox-manifest.json'), path.join(FIREFOX_DIST, 'manifest.json'));
+
+    // Zip for AMO upload
+    const pkg = JSON.parse(fs.readFileSync('./package.json', 'utf8'));
+    const zipName = `nostrkey-firefox-v${pkg.version}.zip`;
+    const zipPath = path.join('./distros', zipName);
+    if (fs.existsSync(zipPath)) fs.unlinkSync(zipPath);
+    execSync(`cd ${FIREFOX_DIST} && zip -r ../${zipName} . -x '.*'`);
+
+    console.log(`Firefox build complete → ${FIREFOX_DIST}/`);
+    console.log(`Firefox zip → ./distros/${zipName}`);
+}
+
 // ---------------------------------------------------------------------------
 // Main
 // ---------------------------------------------------------------------------
@@ -206,8 +234,11 @@ async function run() {
     if (target === 'all') {
         await buildSafari(buildOpts);
         await buildChrome(buildOpts);
+        await buildFirefox(buildOpts);
     } else if (target === 'chrome') {
         await buildChrome(buildOpts);
+    } else if (target === 'firefox') {
+        await buildFirefox(buildOpts);
     } else {
         // default: safari
         await buildSafari(buildOpts);

package.json

@@ -13,6 +13,8 @@
         "build:prod": "tailwindcss -i './src/options.css' -o './src/options.build.css' --minify && ./build.js prod",
         "build:chrome": "tailwindcss -i './src/options.css' -o './src/options.build.css' && ./build.js dev chrome",
         "build:chrome:prod": "tailwindcss -i './src/options.css' -o './src/options.build.css' --minify && ./build.js prod chrome",
+        "build:firefox": "tailwindcss -i './src/options.css' -o './src/options.build.css' && ./build.js dev firefox",
+        "build:firefox:prod": "tailwindcss -i './src/options.css' -o './src/options.build.css' --minify && ./build.js prod firefox",
         "build:all": "tailwindcss -i './src/options.css' -o './src/options.build.css' && ./build.js dev all",
         "build:all:prod": "tailwindcss -i './src/options.css' -o './src/options.build.css' --minify && ./build.js prod all",
         "watch": "./build.js watch",

src/firefox-manifest.json

@@ -0,0 +1,60 @@
+{
+    "manifest_version": 3,
+    "default_locale": "en",
+    "name": "__MSG_extension_name__",
+    "description": "__MSG_extension_description__",
+    "version": "1.5.7",
+    "short_name": "NostrKey",
+    "author": "Humanjava Enterprises Inc",
+    "homepage_url": "https://nostrkey.com",
+    "icons": {
+        "16": "images/toolbar-16.png",
+        "48": "images/icon-48.png",
+        "96": "images/icon-96.png",
+        "128": "images/icon-128.png",
+        "256": "images/icon-256.png",
+        "512": "images/icon-512.png"
+    },
+    "background": {
+        "scripts": ["background.build.js"]
+    },
+    "content_scripts": [
+        {
+            "js": ["content.build.js"],
+            "matches": ["<all_urls>"]
+        }
+    ],
+    "action": {
+        "default_title": "Open NostrKey",
+        "default_popup": "sidepanel.html",
+        "default_icon": {
+            "16": "images/toolbar-16.png",
+            "19": "images/toolbar-19.png",
+            "32": "images/toolbar-32.png",
+            "38": "images/toolbar-38.png",
+            "48": "images/toolbar-48.png",
+            "72": "images/toolbar-72.png"
+        }
+    },
+    "options_ui": {
+        "page": "full_settings.html",
+        "open_in_tab": true
+    },
+    "permissions": ["storage", "clipboardWrite"],
+    "host_permissions": ["<all_urls>"],
+    "web_accessible_resources": [
+        {
+            "resources": ["nostr.build.js"],
+            "matches": ["<all_urls>"]
+        }
+    ],
+    "content_security_policy": {
+        "extension_pages": "script-src 'self'; object-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; connect-src 'self' wss://*; frame-src 'self'; font-src 'self'; media-src 'self'; child-src 'self';"
+    },
+    "browser_specific_settings": {
+        "gecko": {
+            "id": "nostrkey@nostrkey.com",
+            "strict_min_version": "109.0"
+        }
+    }
+}