Flowstop

About

Absolute control of your browser's internet connection. Flowstop is a precision network isolation tool that lets you instantly cut the internet to any specific tab—without affecting the rest of your browser.
Traditional blockers and firewalls block specific URLs or entire apps. Flowstop does something different: it uses Chrome's native DevTools Protocol to sever the connection at the tab level. When Flowstop is active, the tab behaves exactly as if you unplugged your Wi-Fi, while your other tabs continue working perfectly.
Note: Because Flowstop uses Chrome's native debugging protocol to ensure airtight security, Chrome displays a yellow banner ("Flowstop started debugging this browser") on isolated tabs. This is a built-in Chrome security feature to ensure you always know when a tab is isolated.