Feature Request: Auto-Detection of Terminal-Based Web Apps (e.g., xterm.js) for Default Vimium Disablement

Feature Request: Auto-Detection of Terminal-Based Web Apps (e.g., xterm.js) for Default Vimium Disablement

Problem:
Vimium currently relies on URL matching to determine where it should be enabled or disabled. This approach is insufficient for dynamic environments where:

• Users access terminal interfaces via tools like [ttyd](https://github.com/tsl0922/ttyd), which run on different IPs/ports.
• These tools utilize [xterm.js](https://xtermjs.org/) under the hood.
• Other apps like [webvm.io](https://webvm.io/) also embed xterm.js or similar terminal emulators.

Request:
Implement a mechanism for Vimium to detect terminal-based web apps dynamically by:

1. Detecting the presence of xterm.js: Check for global objects, DOM elements, or other indicators unique to xterm.js.
2. Auto-disable Vimium by default: When such terminal environments are detected, prevent keybinding conflicts without relying on static URL rules.
3. Optional Setting: Provide a toggle in Vimium settings to enable/disable this behavior for users who may prefer manual control.

Why It Matters:

• IPs and ports change frequently in dynamic setups, making URL-based management impractical.
• Terminal apps often require precise keyboard input, and Vimium keybindings can interfere with terminal workflows.
• A detection-based approach improves ergonomics and user experience without additional configuration overhead.

Potential Indicators for Detection:

• DOM elements with classes like .xterm, .xterm-viewport, .xterm-screen.
• Global JavaScript objects or functions such as Terminal from xterm.js.
• Mutation observers for dynamic terminal instantiation.

Impact:
This change would significantly improve usability for users working with web-based terminals, especially in development, IoT (e.g., Raspberry Pi), and remote administration contexts.

Related Projects Using xterm.js:

• [ttyd](https://github.com/tsl0922/ttyd)
• [webvm.io](https://webvm.io/)
• Numerous custom self-hosted terminal UIs

Thank you for considering this enhancement!

The issue names no files or tests. Start by locating Vimium’s URL-based enable/disable logic and settings entry points, then determine how terminal indicators and dynamically created elements should be handled. Done means terminal-based web apps are disabled by default, with a user setting to control the behavior.