ScreenLab | Multi-Screen Preview EN
Lucas · Firefox
Multiple screen preview for responsive web development - view pages at different device sizes, all synchronized
<all_urls>），意味着它可以读取你在任意站点的页面内容，包括已登录的页面。这是许多扩展正常工作的必要条件，但也值得你确认来源可信。
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简介
Stop wondering if your site looks right. Know it does.
Stop resizing your browser window over and over. ScreenLab lets you view any webpage across multiple device sizes simultaneously — no more guesswork, no more missed breakpoints.
🎯 One Click. Every Screen.
Toggle ScreenLab and instantly see your site rendered across phones, tablets, and desktops side by side. Test responsive layouts in real-time without leaving your browser.
📱 Pixel-Perfect Device Presets
iPhone, iPad, Android, MacBook, 4K monitors — all the devices your users actually use. Pre-configured viewport sizes so you can test what matters.
✨ Custom Viewports
Need a specific screen size? Create unlimited custom viewports. Save them for quick access across all your projects.
🔒 Lock Height Mode
Keep all screens contained within your viewport, or unlock to see full-page scrolling behavior. You control the view.
🔄 Synchronized Scrolling
Scroll once, scroll everywhere. All viewports stay perfectly in sync so you can compare sections across every breakpoint instantly.
📸 One-Click Screenshot Export
Capture all viewports at once and download as a ZIP. Perfect for design reviews, client presentations, or QA documentation.
🌙 Dark Mode Built In
Easy on the eyes during late-night debugging sessions. Toggle between light and dark themes instantly.
⚡ Works Everywhere
Chrome, Firefox — ScreenLab runs on all major browsers. Test any website, any URL, any time.
💎 Free plan with everything you need
Test up to 3 screens at the same time for free. Upgrade to our really cheap subscription-less "Plus" plan for unlimited viewports, custom presets, and screenshot exports.
ScreenLab | Multi-Screen Preview 是做什么的
ScreenLab | Multi-Screen Preview 是一款面向 Firefox 的开发者工具类扩展，主要用来调试页面、查看样式与请求、测试接口、辅助前端开发。官方对它的介绍是：Multiple screen preview for responsive web development - view pages at different device sizes, all synchronized在Firefox 附加组件商店（AMO）上，它当前版本 1.0.0，约 21 名用户。
适合什么人用
从功能定位看，ScreenLab | Multi-Screen Preview 更适合前端工程师、测试与需要经常查看页面结构的用户。如果你平时只是偶尔遇到相关需求，用浏览器自带功能也能凑合；但如果这件事每天都发生，装一个专门处理它的扩展通常比手动操作省事得多。需要注意的是它作用于所有网站，装上后建议先观察一两天，确认不影响常用站点的正常使用。
怎么安装 ScreenLab | Multi-Screen Preview
- 打开Firefox 附加组件商店（AMO）上的官方页面；
- 点「添加到浏览器」并确认权限提示；
- 装好后在扩展列表里固定图标，方便随时开关。
本站只做索引与介绍，安装包来自官方商店。如果商店页面提示当前地区不可用，说明该扩展未在你所在区域上架。
常见问题
ScreenLab | Multi-Screen Preview 是免费的吗？
ScreenLab | Multi-Screen Preview 在Firefox 附加组件商店（AMO）免费提供下载。它是浏览器扩展，装上就能直接用，不需要注册账号。
ScreenLab | Multi-Screen Preview 安全吗？
它只申请了 0 项权限，范围比较克制，没有申请「读取所有网站数据」这种大权限。
ScreenLab | Multi-Screen Preview 支持哪些浏览器？
当前收录的版本来自Firefox 附加组件商店（AMO），适用于 Firefox。同一个扩展在其他商店可能有对应版本，但功能与版本号不一定相同。
怎么卸载 ScreenLab | Multi-Screen Preview？
在扩展管理页找到 ScreenLab | Multi-Screen Preview，点移除即可。它在本地保存的设置会一起清掉，不会残留数据。
权限清单 来自 manifest.json 原文
站点访问 1
<all_urls>
接口权限 3
activeTabscriptingstorage