It remembers why
Every page arrives with its cause attached — the link you followed, the phrase you highlighted, the search you ran. Not a list of URLs: a branching trail with reasons on the edges.
Browser extension · nothing leaves your machine
Your research is a shape. ContextTab draws it.
Twenty tabs deep and you have lost the thread: which page led to which, why you opened that one, what the good bit said. ContextTab watches the lineage as you browse and turns it into a map you can read, annotate, park, and hand to someone else as a document.
No account needed to browse Your browsing never leaves the browser Cancel any time
Today's trail
6 live · 0 parked
Selected
Kubernetes memory leaks
The root of this trail — where the question started.
This is the real thing, in miniature. Nothing here is sent anywhere.
Three things, done properly
Not a bookmark manager. Not a tab suspender. A record of how you got here.
It parks what you are not reading
Freeze a branch and its tabs are discarded from memory but kept on the map, with their notes and scroll position. Thaw one and it comes back exactly where you left it.
It hands you a document
One click turns a branch — or your whole session — into Markdown, with the trail, your highlights, your notes, and a source list. Ready to paste into a doc, an issue, or your notebook.
Where your browsing goes
Nowhere. That is the whole answer, and it is worth being precise about.
The map is local
Titles, URLs, notes, highlights and the shape of the trail live in your browser's own storage. There is no sync server, and no code path that could add one.
The account knows one thing
Signing in answers exactly one question — is this account entitled? The server stores a salted hash of your Google id, your subscription status, and the dates. Never a page you visited.
AI uses your own key
Summaries go straight from your browser to whichever provider you chose, with a key encrypted at rest under a passphrase only you know. Neither the key nor the text passes through us.
Pricing
Everything about how the dock looks and works is free, for good. The subscription covers three things.
Basic
Free · always
No account, no card, no expiry.
- Lineage tracking up to 30 pages
- Freezing, thawing and search
- Every part of the interface
- Markdown and JSON export
Pro
Monthly or yearly
The trial starts when you sign in. Cancel any time; access lasts to the end of the period you paid for.
- No ceiling on the map, and trees merged across windows
- Notes on pages, with due dates and checklists
- AI summaries using your own API key
- Five more colour modes
Getting started
Install the extension
Chrome, Brave, Edge, Arc, Vivaldi — anything Chromium. It starts drawing your trail immediately, with no account.
Open the dock
Alt+Shift+D, or the toolbar icon. Browse as you normally would and watch the shape appear.
Sign in when you want Pro
One click with Google. That starts the free trial, and your plan follows the account to any machine.