message: sparkles: beautify generated manifest.json
diff: @@ -216,7 +216,7 @@ const stringSrc = (filename, string) => {
  const browserManifest = require(`./tools/manifests/${browser}.js`);
  gulp.task('manifest', () => {
  - const manifestJson = JSON.stringify(browserManifest);
  + const manifestJson = JSON.stringify(browserManifest, null, 2);
  return stringSrc('manifest.json', manifestJson).pipe(gulp.dest('./dist/'));
  });
  