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SECURITY REPORT · EXTENSHI SCAN

Is Tab Groups Sync safe?

Checked version: 5.6.33 · Scan date (UTC): 2026-08-24

Firefox extension·by Eger37
75
/ 100 SAFETY SCORE
CAUTION
Mostly fine, but a few things worth reviewing before you install.

Automated analysis of publicly available code — not a professional security audit. It may produce false positives and does not prove an extension is unsafe or safe. Treat it as one signal among many. Disclaimer · Report an issue

How it ranks

Tab Groups Sync's safety score vs every other extension we've scanned
Globally
13%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 435,723 extensions
In Tabs
6%of tabs extensions carry more risk
This extension
Riskier ←→ Safer
Ranked against 12,778 tabs extensions
Findings
31
median 7Lower is safer
Critical findings
3
median 0Severity = Critical
Permissions
18
median 3Declared in manifest
Active users
12
median 3vs category median

Findings breakdown

Automated security signal · 31 distinct issues across 6 severities
31
distinct issues
detected

Permissions requested

8 risky permissions of 18 total
3 critical permissions require attention
This extension requests 18 permissions in total. 8 of them grant broad capabilities that are worth a careful look.
Critical
Manage other extensions

Can enable, disable, or uninstall other browser extensions

Critical
Access to all websites

Can read and modify content on every website you visit

Critical
Communicate with desktop apps(optional)

Can exchange messages with applications installed on your computer

High
View open tabs

Can see URLs and titles of all open tabs

High
Access browser cookies

Can read and modify cookies, potentially accessing login sessions

High
Manage downloads

Can initiate downloads and access your download history

Medium
Show notifications

Can display desktop notifications outside the browser

Medium
Custom menus

Can add custom items to the browser context menu

Medium
Container tabs

Can manage Firefox container tabs and their identities

Medium
Access session data

Can query and restore recently closed tabs and windows

Medium
Store local data

Can save data locally in the browser for persistence

Medium
Unlimited local storage

Can store large amounts of data locally without size limits

Medium
Access bookmarks

Can read and modify your saved bookmarks

Medium
Browser settings

Can read and modify browser-wide settings

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Scan performed by extenshi.io · Oct 22, 2026
Browser extensions made transparent.

What this assessment covers

Store listing
Firefox
Checked version
5.6.33
Current listed version
5.6.33
Scan date (UTC)
Assessment status
Completed

Recorded findings: 3 critical and 7 high severity. Read the finding details before interpreting the score; automated flags are not proof of malicious behaviour.

Automated analysis looks for suspicious code, permissions and other risk signals. It does not observe every runtime behaviour or independently audit the publisher’s servers. A low-risk result is not a guarantee of safety. How our checks work.

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