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MCP-B Agent

Chrome extension by webmcp · Productivity · Tools

A Chrome extension in Productivity · Tools with 1 000 users, a small but real audience.

Every site you visit. This extension can read and change the content of any page you open.

What the developer says, and 5 screenshots

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
1 000
Rating
3.0 (8 ratings)
Users, last 13 days
unchanged
Rating, last 30 days
Not watched long enough to say
Version
1.1.0.243
Updated in the store
2026-07-29
Published
2025-06-24
Manifest
V3
Browser access
23 permissions, 1 site pattern

How it has moved

Users
unchanged since 01.09
1k · 2 readings
  1. 2026-09-011k
  2. 2026-09-131k
Rating
unchanged since 01.09
reviewsrating 3.00 · 2 readings
  1. 2026-09-01reviews8rating3.00
  2. 2026-09-13reviews8rating3.00
Users
unchanged since 01.09
1k · 2 readings
  1. 2026-09-011k
  2. 2026-09-131k
Rating
unchanged since 01.09
reviewsrating 3.00 · 2 readings
  1. 2026-09-01reviews8rating3.00
  2. 2026-09-13reviews8rating3.00

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

Every site you visit. This extension can read and change the content of any page you open.

  • Read what you have copied clipboardRead
  • Attach to pages the way developer tools do debugger
  • Read and change your browsing history history
Show the remaining 20
  • See the address and title of every tab you have open tabs
  • Read and change your bookmarks bookmarks
  • Block or redirect requests on the sites it can access declarativeNetRequestWithHostAccess
  • Manage your downloads downloads
  • Sign you in with a Google account identity
  • See the email address of the signed-in Google account identity.email
  • Run its own code on the pages it can access scripting
  • See and restore recently closed tabs sessions
  • See the sites you visit most topSites
  • See when you navigate between pages webNavigation
  • Act on the current tab, but only after you click it activeTab
  • Schedule work to run later alarms
  • Put data on your clipboard clipboardWrite
  • Run work in a hidden page offscreen
  • Run searches in your default search engine search
  • Open a panel beside the page sidePanel
  • Store data in your browser storage
  • Organise your tabs into groups tabGroups
  • Store data in your browser without the usual size limit unlimitedStorage
  • Declares userScripts

The full permission history for this extension

What changed recently

Nothing has moved on this listing since we started watching it.

The publisher

webmcp publishes 2 listings we track, 1k users between them. Listed website: mcp-b.ai.

  1. Rook webmcp · Productivity · Tools · published 2026-08-03 55 users ★ 5.0

Like this one

Listings the catalog judges closest in what they say they do.

  1. Oni3 Describes nearly the same job, smaller audience 3 users
  2. airminal Describes nearly the same job, smaller audience 5 users
  3. Personal Agent Describes nearly the same job 0 users
  4. Ruminer Browser Agent Describes nearly the same job, smaller audience 25 users
  5. HelperAI Describes nearly the same job, smaller audience 8 users

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

Is this your extension?

Connect it to Ext Ops Panel and see installs, uninstalls and uninstall reasons as events arrive, not as a weekly summary.

See what the panel does

Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.