Immersive Web App 是一款专为 Firefox 设计的高性能增强工具，旨在修复 Web App（“安装网站为应用”）模式下的交互断层。本扩展通过底层的逻辑补丁，确保您的网页应用在全屏状态下运行，且所有内容交互始终保持在独立的窗口容器内。以下是该扩展核心功能的实现技术细节：

智能环境感知与自动化全屏 (Automated Fullscreen) 实现原理：扩展利用 CSS 媒体查询接口 window.matchMedia 实时监测当前的显示模式（如 standalone 或 minimal-ui）。技术细节：一旦检测到网页运行在应用容器中，Content Script 将通过异步消息机制通知后台脚本。后台脚本调用 Firefox 原生的 browser.windows.update API，将当前窗口状态原子化地更新为 fullscreen。优化：该过程包含“成功即销毁”逻辑，一旦锁定全屏，相关的监听器将自动从内存中移除，实现零持续占用。
JIT (即时) 跳转拦截技术 (Link "Escape" Fix) 实现原理：针对 target="_blank" 导致的窗口逃逸问题，我们采用了 JIT (Just-In-Time) 拦截策略，取代了高耗能的 DOM 持续扫描。技术细节：在顶层 document 挂载一个处于“捕获阶段”(Capture Phase) 的全局点击监听器。在用户手指按下的微秒级时间内，脚本会向上遍历 DOM 路径。逻辑闭环：如果识别到目标链接，脚本会即时剥离其 target 属性，并检查全局 base 标签状态。若判定为新窗口行为，则将其重定向至当前窗口加载。这种方式完美兼容 React/Vue 的内部路由，不会产生任何页面闪烁。
跨沙箱 API 虚拟化 (window.open Interception) 实现原理：针对脚本触发的 window.open，扩展利用了 Firefox Gecko 引擎特有的高级特性。技术细节：放弃了易被 CSP 安全策略阻断的 DOM 注入，改用 exportFunction 和 wrappedJSObject 接口。我们将沙箱内的安全拦截逻辑直接导出至网页主世界的全局作用域。结果：这使得扩展能够以“原生”的速度劫持 window.open 调用，在不触发任何 CSP 违规报错的前提下，将所有弹窗请求安全地引导至当前沉浸式窗口。
高性能与隐私保护 (Performance & Privacy) 无感知运行：彻底废弃了 MutationObserver 等重度轮询技术。整个扩展的点击寻址算法复杂度极低 (O(log N))，在标准硬件上执行耗时小于 0.1ms。纯本地处理：所有拦截逻辑均在本地浏览器进程中完成。本扩展不申请联网权限，不访问剪贴板，不收集、不存储、不传输任何用户行为数据。

进阶使用建议：为了获得更极致的体验，我们强烈建议将本扩展与 Gesturefy 等鼠标手势扩展配合使用。在全屏模式下，通过手势即可轻松完成前进、后退操作，让 Web App 的交互如同原生软件般丝滑。关于开发：本扩展由我和 Gemini 共同协作开发，结合了人类的创意构思与 AI 的架构优化。 Immersive Web App is a high-performance utility specifically engineered for Firefox to bridge the interactive gaps in the native "Install Site as App" (PWA) mode. By implementing low-level logic patches, it ensures your web applications remain in a seamless fullscreen state and that all interactions are strictly confined to the standalone window container.

Smart Environment Awareness & Automated Fullscreen Mechanism: The extension leverages the window.matchMedia interface to monitor display modes (such as standalone or minimal-ui) in real-time. Technical Details: Once an app container environment is detected, the Content Script triggers an asynchronous message to the Background Script. The Background Script then invokes the native Firefox browser.windows.update API to atomically transition the window state to fullscreen. Optimization: This process includes a "Success-and-Dispose" logic—once fullscreen is locked, associated listeners are automatically purged from memory.
JIT (Just-In-Time) Interception for Link "Escape" Mechanism: To solve the issue of links "escaping" via target="_blank", we utilize a JIT interception strategy, replacing resource-heavy DOM polling. Technical Details: A global click listener is mounted on the document during the Capture Phase. Within microseconds of a user interaction, the script traverses the DOM path. Logical Loop: If a target link is identified, the script strips the target attribute and evaluates the global base tag status just-in-time. Any new-window behavior is redirected to the current window, ensuring compatibility with modern SPA frameworks.
Cross-Sandbox API Virtualization (window.open Interception) Mechanism: For script-triggered window.open calls, the extension utilizes advanced features unique to the Firefox Gecko engine. Technical Details: We have deprecated traditional DOM injection in favor of the exportFunction and wrappedJSObject interfaces to export safe interception logic from the sandbox. Outcome: This enables the extension to hijack window.open calls at native speeds without triggering CSP violation errors.
Performance & Privacy-First Architecture Efficiency: By eliminating MutationObserver polling, the click-path traversal maintains ultra-low complexity (O(log N)). Execution time is typically under 0.1ms on standard hardware. Local Processing: All logic is processed locally. The extension does not request network permissions and strictly follows a Zero Data Collection policy.

Recommendation: For an even better experience, pair this extension with Gesturefy (or other mouse gesture add-ons). Using mouse gestures in a fullscreen immersive environment allows for seamless navigation (Back, Forward, Close) that mimics the fluidity of professional desktop software. About Development: This extension was co-developed through a collaboration between myself and Gemini, combining human creative vision with AI-driven architectural optimization.

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