Umbra - Browser Control for AI Agents
#224,447 of 270,396 by installs on Chrome · #139,715 of 163,941 in productivity
First seen by this census 09/01/2026 — the store does not publish a creation date
Last updated 08/29/2026
Tracked since 09/01/2026
Compare with another extension
Category: productivity / developer
Languages: English
Description
Give a local agent scripted control of tabs it owns in your signed-in Chrome. No focus theft. Requires a local companion server.
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Growth
Change in installs. This store publishes the count rounded to one or two significant figures, so it does not move when the listing grows - it moves when the rounding rolls over. The figures below are therefore what was actually observed between the two crawls named in "measured over", not scaled to the window, and the percentage is of that same rounding step - so a small listing crossing a bucket shows a very large one. A window needs a full period of history before it reports anything.
| Per | Growth | Growth % | Actual change | Measured over |
|---|---|---|---|---|
| day | 0 | — | 0 | 1.1 days |
| week | 0 | — | 0 | 8.8 days |
| month | Not enough history yet | |||
| year | Not enough history yet | |||
History
Users
Permissions
Access level: Broad — Reaches every website you visit, or holds a powerful capability.
- Attach to your tabs' debugger, giving it deep access to page content and network traffic
- If you allow it: reads and changes your data on all websites
Ad blockers, password managers and VPNs need this kind of access to do their job. This describes what the extension can reach, not how it behaves.
Manifest V3
No website access
Can ask you for access to all websites
- activeTab — See the page you're currently viewing, only when you click the extension
- alarms — Schedule its code to run at a later time
- debugger ⚠ — Attach to your tabs' debugger, giving it deep access to page content and network traffic
- offscreen — Run a hidden page to do background work, such as playing audio or reading documents
- scripting — Run scripts on web pages you visit
- storage — Save its own settings and data locally
- tabGroups — Organise your tabs into groups
- tabs — See your open tabs and the pages you're on