Is Close duplicate tab Safe? — Extension Safety Profile
Quick verdict: Close duplicate tab earns a safety grade A, 83.1 out of 100, based on 5 of 5 dimensions.
83.1/100
Grade A · 5 of 5 checks
What we found
Automated safety profile from public signals (the extension's manifest & permissions, store listing, publisher, privacy policy). A full review hasn't been published yet.
What this safety grade means
Close duplicate tab earns a safety grade of A (83.1/100), measured across 5 of 5 dimensions. Its strongest area is Maintenance & Ownership (100%). The weakest is Publisher & Identity (60%) — what holds its grade back the most.
On the public records we can check, Close duplicate tab comes through cleanly. 6,000 active users/installs reported on the store. Store rating 4.6/5 from 18 user ratings. Last updated on the store 2026-08-24. This is an automated profile, not a hands-on review — so treat the grade as a starting point: open Close duplicate tab's own store listing and privacy policy before installing, and weigh it against the other browser extensions we track below.
Safety Signals
Based on 5 of 5 safety dimensions
| Dimension | Score | Bar | Source |
|---|---|---|---|
| Publisher & Identity | 60% · 4.8/8 pts 2 of 5 checks verified | Automated signals | |
| Permissions & Access | 90% · 22.5/25 pts 3 of 3 checks verified | Automated signals | |
| Data & Privacy | 83% · 13.2/16 pts 4 of 5 checks verified | Automated signals | |
| Maintenance & Ownership | 100% · 7.5/7.5 pts 1 of 2 checks verified | Automated signals | |
| Community Reputation | 73% · 7.3/10 pts 2 of 4 checks verified | Automated signals |
In-depth safety analysis
The requested permissions are standard for a duplicate tab manager. The tabs and windows APIs let the extension read tab titles and URLs, identify duplicates across all open windows, and close unwanted tabs. The tabGroups permission allows it to work with tabs that are part of a group, and storage saves your preferences locally. This scope is normal for its category and is necessary to perform its core function.
Any extension with access to tabs can technically see every URL you have open, even if it only needs to find duplicates. While the developer declares that data is not sold, used for unrelated purposes, or used for creditworthiness, a careful user should be aware that these permissions inherently enable broad reading of browsing activity. For this type of utility, processing is typically done locally, but it's wise to check whether the extension’s code is open source or review its privacy policy in detail if you handle sensitive information in your tabs.
The fact sheet shows a high safety score overall, with a strong Maintenance & Ownership dimension (100%), indicating the extension is actively updated and ownership is clear. The weakest dimension is Publisher & Identity (60%), which is common for small or individual developer tools and doesn’t necessarily signal a problem. The privacy declarations are positive, though they remain self-reported.
AI-assisted analysis of the documented signals above (permissions, store data, privacy practices) — explains what they mean and the risks typical for this category. Not a hands-on test.
What the store listing shows
Who's Behind Close duplicate tab?
- Publisher heppokofrontend.dev
Public records identify the publisher, but no individual founders or a separate registered company are named — which is what holds the Publisher & Identity score back. Less public information about who operates an extension means less you can verify about their long-term accountability.
How it compares
Among the 838 browser extensions we track, Close duplicate tab scores higher on safety than 75% of them.
Computed from our own database of assessed browser extensions — updated as we track more.
Evidence on File (12)
Close duplicate tab FAQ
- Is Close duplicate tab safe?
- Close duplicate tab earns a safety grade of A (83.1/100) on our evidence-based assessment, based on 5 of 5 safety dimensions we could verify from public records. This is an automated profile built from public records, not a hands-on review.
- Who is behind Close duplicate tab?
- Close duplicate tab is operated by heppokofrontend.dev.
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