AI agents are good at deciding what to do on a web page and bad at getting there: logins, two-factor prompts, cookie walls, and a fresh headless profile with nothing in it.
T3rnel Browser takes the other route. It is a browser extension that turns the Chrome, Edge, Firefox or Opera you already use — signed in, with your sessions — into a Model Context Protocol server. It is also a developer toolkit you will reach for whether or not an agent is running.
What your agent gets
97 tools over MCP: navigate, click, fill forms (including ProseMirror, Lexical and Slate editors), read pages and semantic snapshots, take screenshots and PDFs, capture network and console traffic, run accessibility, performance and SEO audits, compare screenshots, and record and replay sessions.
Any MCP client works — the free MCP Session Bridge connects it to the extension on your own machine.
Safety, because a browser is your logged-in life
- Passwords and token-like values are redacted before any snapshot or page read reaches the model
- Page text is scanned for prompt-injection patterns and marked as untrusted data
- An approval gate you can switch on: guarded actions stop and ask, and one approval covers one action
- A local audit log of every tool call, and a timeline you can scrub back through when a run goes wrong
- DOM compression and delta snapshots keep large pages from eating your context window
What you get, with or without an agent
- Hover any element and copy its CSS as written — plain CSS, Tailwind, styled-components, Emotion, CSS Modules, SCSS, Less or a JSX style object
- Full-page screenshots with sticky headers pinned once, lazy content loaded and cookie banners dismissed; annotate and export as PNG, JPG, WebP or PDF
- Record a flow once and export a real Playwright, Puppeteer, Cypress or Selenium test that waits on conditions, not sleeps
- A React component inspector, a Markdown viewer with Mermaid and math, a colour picker that hands back a ready
--custom-property
Privacy
Your pages, styles, screenshots and sessions stay on your machine. The extension contacts us only to show the current price and to deliver and renew a Pro licence, and sends anonymous usage counts only if you switch that on.
Pricing
The core tools are free — no account, no expiry. Pro is one payment for three machines, paid with PayPal, a card, or EcoCash and OneMoney through PayNow. It switches itself on the moment the payment clears, even if you closed the browser while paying, and the key is emailed to you as a backup.
Launch offer: share T3rnel with three friends or join the mailing list, then email t3ratech.dev@gmail.com for a launch-price code.
👉 browser.t3ratech.co.zw — Chrome, Edge, Firefox and Opera.
I would love feedback from anyone running agents against real, authenticated sites — what breaks for you today?
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