Update Firefox Browser script on Mac

Added spaces as this is how it downloads and extracts to Mac

Author: David Henley

package.json

@@ -6,12 +6,12 @@
   "scripts": {
     "start": "run-script-os",
     "start:win32": "browser-sync start --server --files '**/*.css, **/*.html, **/*.js, !node_modules/**/*' --directory --port 7777 --browser \"C:\\Program Files\\Firefox Developer Edition\\firefox.exe\"",
-    "start:darwin:linux": "browser-sync start --server --files '**/*.css, **/*.html, **/*.js, !node_modules/**/*' --directory --port 7777 --browser 'FirefoxDeveloperEdition'"
+    "start:darwin:linux": "browser-sync start --server --files '**/*.css, **/*.html, **/*.js, !node_modules/**/*' --directory --port 7777 --browser 'Firefox Developer Edition'"
   },
   "author": "",
   "license": "ISC",
   "devDependencies": {
     "browser-sync": "^2.18.13",
     "run-script-os": "^1.0.2"
   }
-}
+}