feat: add Firefox manifest and webpack config

extension/manifest.firefox.json

@@ -0,0 +1,36 @@
+{
+  "manifest_version": 3,
+  "name": "idfoto",
+  "version": "0.1.0",
+  "description": "Two-factor encrypted password manager",
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "idfoto@adlee.work",
+      "strict_min_version": "128.0"
+    }
+  },
+  "permissions": ["storage", "activeTab", "clipboardWrite"],
+  "host_permissions": ["<all_urls>"],
+  "background": {
+    "scripts": ["service-worker.js"]
+  },
+  "action": {
+    "default_popup": "popup.html",
+    "default_icon": {
+      "16": "icons/icon-16.png",
+      "48": "icons/icon-48.png",
+      "128": "icons/icon-128.png"
+    }
+  },
+  "content_scripts": [{
+    "matches": ["<all_urls>"],
+    "js": ["content.js"],
+    "run_at": "document_idle"
+  }],
+  "content_security_policy": {
+    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'"
+  },
+  "web_accessible_resources": [{
+    "resources": ["setup.html", "setup.js", "styles.css", "idfoto_wasm_bg.wasm", "idfoto_wasm.js"]
+  }]
+}