Cluster - Window & Tab Manager
Window and Tab manager for managing multiple open tabs and windows with simplicity.
Manifest V2
- Users:
- 40,000+
- Rating:
- 4.44 (760) 1 new ratings
- Version:
- 2.2.6 (Last updated: 2019-08-04)
- Creation date:
- 2019-08-04
- Permissions:
- storage
- activeTab
- tabs
- chrome://favicon/
- unlimitedStorage
- Size:
- 652.29K
- URLs:
- Website
- Full description:
- See detailed description
- Source:
- Chrome Web Store
- Updated:
- a day ago
User reviews
Cluster - Window & Tab Manager is widely praised as one of the best tab management extensions, featuring easy multi-window merging, batch operations, and support for users with large tab counts. Loyal users appreciate its clean interface and session saving capabilities. However, it has recently been disabled by Google for not following updated extension policies, causing loss of functionality and saved data. Additionally, users report lack of developer support, missing integration with Chrome's tab groups, and occasional bugs. The community expresses strong disappointment and hopes for updates or alternatives.
Pros
- Highly effective and user-friendly tab and window management, praised as the best tab manager by many users.
- Unique features like merging separate windows into one, batch operations (moving, deleting, detecting duplicates), and a clean multi-column tab view.
- Capability to handle a very large number of tabs efficiently, helpful for users with many open tabs.
- Positive long-term user experience over many years, with users showing loyalty and willingness to pay for it.
- Availability of session saving and ability to retrieve closed windows.
Cons
- Extension has been disabled or removed due to not complying with Google's latest best practices for extensions, causing loss of functionality and inability to install on newer versions of Chrome.
- Users have experienced loss of saved sessions and tabs, with no effective support or recovery options available.
- Lack of support or updates from developers recently, with dead website and unreachable support email.
- No integration or handling of Chrome's native tab groups, resulting in broken groups and making tab management cumbersome for users relying on groups.
- Certain bugs such as deleting tab groups during renaming, synchronization issues across devices, and forced tab opening behavior (opening tabs to the right) with no option to disable.
Recent reviews
I love Cluster so much I'm going to attempt using Google's Gemini 2.5 to add tab group headings within Cluster's tab lists, wish me luck. I don't know if this helps, but after reading about other people's recent issues, I can say that while using Slimjet browser, Cluster hasn't encountered any issues, lost tabs or having had any other extensions being turned off. Slimjet is a Chromium-based browser, so it's identical to Chrome in most ways, except it has additional features & options. Something I like the most is being able to 'Auto hide on top' the Bookmark Bar, which makes it so it's hidden until you move your mouse under the address bar, so this always gives you more browser page screen space.
by 
Riaz Ali, 2025-04-06
Riaz Ali, 2025-04-06Awesome extension! I've used it for years, and now Google kills it without warning.
To any and all Google employees:
Your Learn More / Help section doesn't tell me which "best practices" the extension no longer follows. And that's a misnomer, because the extension didn't change anything. The "best practices" changed, without any warning to users.
So now a great extension is dead, and Google won't truly tell me why.
Google has engineers that make great software. Yet they can't give users a notification that "best practices" are changing? That the data users had the extension collect may be lost forever? That a tool we've relied upon for years may die? Really? With all their knowledge and skills, they can't give us a simple notification???
by 
Chris Vrem, 2025-03-31
Chris Vrem, 2025-03-31Best I've used so far. Very easy to merge separate windows in to one. Can be opened as a separate tab, not a popup; that way you can organize a thousand tabs.
by 
Nep Llamo, 2025-03-29
Nep Llamo, 2025-03-29Extension safety
Risk impact
Cluster - Window & Tab Manager requires a few sensitive permissions. Exercise caution before installing.
Risk impact analysis details
- Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
Risk likelihood
Cluster - Window & Tab Manager is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this extension.
Risk likelihood analysis details
- High This extension publisher URL may be invalid
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