web: Split manifest into firefox vs other

web/packages/extension/manifest_other.json5

@@ -0,0 +1,54 @@
+{
+    "manifest_version": 3,
+    "name": "Ruffle",
+    "version": null, // Filled by Webpack.
+    "default_locale": "en",
+    "description": "__MSG_description__",
+    "homepage_url": "https://ruffle.rs/",
+
+    "browser_action": {
+        "default_popup": "popup.html",
+        "browser_style": true,
+    },
+    "background": {
+        "scripts": ["dist/background.js"],
+        "persistent": true,
+    },
+    "content_scripts": [
+        {
+            "matches": ["<all_urls>"],
+            "exclude_matches": [
+                "https://sso.godaddy.com/*",
+                "https://authentication.td.com/*",
+                "https://*.twitch.tv/*",
+                "https://www.tuxedocomputers.com/*",
+                "https://*.taobao.com/*",
+            ],
+            "js": ["dist/content.js"],
+            "all_frames": true,
+            "run_at": "document_start",
+        }
+    ],
+
+    // 'wasm-eval' added by Webpack for Chrome extension.
+    "content_security_policy": "default-src 'self'; script-src 'self'; style-src 'unsafe-inline'; connect-src *; media-src *; img-src data:;",
+
+    "icons": {
+        "16": "images/icon16.png",
+        "32": "images/icon32.png",
+        "48": "images/icon48.png",
+        "128": "images/icon128.png",
+        "180": "images/icon180.png",
+    },
+    "options_ui": {
+        "page": "options.html",
+        "open_in_tab": true,
+    },
+    "permissions": [
+        "<all_urls>",
+        "storage",
+        "webRequest",
+        "webRequestBlocking",
+    ],
+    "web_accessible_resources": ["*"],
+}

web/packages/extension/webpack.config.js

@@ -81,7 +81,7 @@ function transformManifest(content, env) {
 /**
  * @type {import("webpack-cli").CallableOption}
  */
-export default function (env, _argv) {
+export default function (/** @type {Record<string, any>} */ env, _argv) {
     const mode =
         /** @type {import("webpack").Configuration["mode"]} */ (
             process.env["NODE_ENV"]
@@ -130,7 +130,9 @@ export default function (env, _argv) {
             new CopyPlugin({
                 patterns: [
                     {
-                        from: "manifest.json5",
+                        from: env["firefox"]
+                            ? "manifest_firefox.json5"
+                            : "manifest_other.json5",
                         to: "../manifest.json",
                         transform: (content) =>
                             transformManifest(