arch firefox

1. hide caption
   去除讨厌的标题栏
2. firefox addons hosts
   无法下载附加组件，添加hosts解决

117.18.232.191 addons.cdn.mozilla.net
117.18.232.191 mozorg.cdn.mozilla.net
117.18.232.191 developer.cdn.mozilla.net
117.18.232.191 support.cdn.mozilla.net
117.18.232.191 marketplace.cdn.mozilla.net
117.18.237.191 getpersonas.cdn.mozilla.net
117.18.237.191 code.cdn.mozilla.net
117.18.232.191 air.cdn.mozilla.net
117.18.232.191 videos.cdn.mozilla.net
117.18.232.191 glow.cdn.mozilla.net
117.18.232.191 download-installer.cdn.mozilla.net
117.18.232.191 download.cdn.mozilla.net
117.18.232.191 fhr.cdn.mozilla.net
117.18.232.191 activations.cdn.mozilla.net
117.18.232.191 cdn.mozilla.net
117.18.232.191 snippets.cdn.mozilla.net
117.18.232.191 telemetry-experiment.cdn.mozilla.net
117.18.237.29 ocsp.digicert.com