webextension+babel scaffolding

.babelrc

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+{
+  "presets": [
+    ["env", {
+      "targets": {
+        "firefox": "55",
+        "chrome": "60"
+      }
+    }]
+  ]
+}

.gitignore

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+node_modules
+extension/*.js
+dist
+chrome-extension-key.pem
+publish_firefox.sh
+publish_chrome.sh

extension/manifest.json

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+{
+    "name": "Nameless extension",
+    "description": "No description.",
+    "version": "0.0.0",
+    "background": {
+        "scripts": ["background_script.js"]
+    },
+    "content_scripts": [{
+        "matches": ["<all_urls>"],
+        "js": ["content_script.js"],
+        "run_at": "document_end"
+    }],
+    "permissions": [
+        "<all_urls>"
+    ],
+    "applications": {
+        "gecko": {"id": "nameless@nameless"}
+    },
+    "manifest_version": 2
+}

package.json

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+{
+  "name": "nameless-webextension",
+  "version": "0.0.0",
+  "description": "No description.",
+  "scripts": {
+    "build": "npm run build-content-script && npm run build-background-script",
+    "watch": "npm run watch-content-script | : | npm run watch-background-script",
+    "build-content-script": "browserify -o extension/content_script.js src/content_script.js",
+    "watch-content-script": "watchify -o extension/content_script.js src/content_script.js -v",
+    "build-background-script": "browserify -o extension/background_script.js src/background_script.js",
+    "watch-background-script": "watchify -o extension/background_script.js src/background_script.js -v",
+    "fx-build": "web-ext build -s extension -a dist && rename -f 's/\\.zip$/.xpi/' dist/*.zip",
+    "fx-run": "web-ext run -s extension",
+    "cr-build": "crx pack extension -o dist/extension.crx -p chrome-extension-key.pem"
+  },
+  "devDependencies": {
+    "babel-preset-env": "^1.6.1",
+    "babelify": "^7.3.0",
+    "browserify": "^14.3.0",
+    "crx": "^3.2.1",
+    "watchify": "^3.9.0",
+    "web-ext": "^1.9.1"
+  },
+  "dependencies": {
+    "webextension-polyfill": "^0.1.1"
+  },
+  "browserify": {
+    "transform": [
+      "babelify"
+    ]
+  }
+}

src/background_script.js

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+import browser from 'webextension-polyfill'

src/content_script.js

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+import browser from 'webextension-polyfill'