Firefox Add-ons

10Versions

0Code reviewed

Not reviewed

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25 indicators in this extension

25 indicators

0 versions analysed

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What our analysis found

Flag Cookies, used by 11,236 people, is not yet reviewed by Extension Auditor. Its permissions mean it can read and change data on all websites and can observe network requests. It comes from a publisher with 8 extensions and was last updated in July 2026.

Flag Cookies Firefox extension security report

ID: flag-cookies

Extension Info & Metadata

Status

Active

Version

3.6.8

Size

0.34 MB

Rating

3.7/5

Reviews

Users

11,236

Type

Extension

Updated

Jul 10, 2026

Publisher Contextual Analysis

Author: Jan Riechers
Privacy: Privacy Policy
MX records exist: Yes
Domain exists: Yes
Is disposable: No
Is role-based: No
Mailbox exists: Yes
Website: Visit

Extensions

Active

Obsolete

Listed

Unlisted

Users

23,069

Screenshots & videos

Install growth

User Growth

Showing data from Sep 13, 2023 to Sep 12, 2024

Versions

-1.36%(-156 users)

Compared to 3 months ago

7 versions released in this period

Rating Count

Total: 22 ratings

Average Rating

Current: 3.91 / 5.0-0.52

See plans

React Flow

Internal permhash`e3f65c0e62…`
No malicious matches

1 other extension carries this fingerprint, none of them known malicious.

Withheldnot flagged

Permhash (Mandiant)`0a8247fb71…`
No malicious matches

1 other extension carries this fingerprint, none of them known malicious.

Withheldnot flagged

Network indicators

24 URLs and 1 IP literals were extracted from this version.

Item	Type	Severity	Description
webRequest	Permission	Critical	This permission enables the extension to monitor and analyze all web requests made by the browser. Rated Critical because it can observe all network traffic including sensitive data, track browsing behavior, and gather authentication tokens.
<all_urls>	Host	Critical	Broad host access — the extension can read/modify content on every website.
cookies	Permission	High	This permission provides full access to read and modify browser cookies. Rated High because it can steal session tokens, modify authentication cookies, and compromise accounts across websites.
clipboardWrite	Permission	High	This permission allows modification of clipboard content. Rated High because it can inject malicious content into the clipboard, modify copied passwords, and manipulate copied data.
webNavigation	Permission	High	This permission enables monitoring of all browser navigation events and transitions. Rated High because it can track every page visit, navigation method, and browsing pattern, potentially exposing sensitive browsing behavior and user activities.
Contextual Risk Factors	Risk Factor	High	The following context increases the overall risk:• 10% increase: Early script execution enables pre-emptive content manipulation
Broad Host Permissions	Risk Factor	High	This extension has broad host permissions allowing it to access many or all websites.
tabs	Permission	Medium	This permission enables tab management and monitoring. Rated Medium because it can track open tabs, access tab metadata, and monitor user browsing patterns.
storage	Permission	Medium	This permission allows storing data locally in the browser. Rated Medium because it can persist sensitive user data, track user activities over time, and potentially store malicious payloads.
unlimitedStorage	Permission	Medium	This permission removes storage quota restrictions. Rated Medium because it can store large amounts of user data without limits, potentially impacting browser performance and storing extensive tracking data.
contextualIdentities	Permission	Medium	This permission (Firefox) manages container tabs. Rated Medium because it can create, remove and inspect the identity containers that isolate a user's sessions from each other.
Early Content Script Execution	Risk Factor	Medium	This extension runs content scripts at document_start.
notifications	Permission	Low	This permission displays system notifications. Rated Low because it can only show user-visible notifications without accessing system data.

25 indicators in this extension

25 indicators

0 versions analysed

Every finding is verified by a security analyst. Unlock the code evidence, indicators and version history.

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About this extension

A cookie and browser storage data manager on steroids to mark, 'flag', and manage cookies using rulesets.

User reviews

2.4 out of 5 · 10 most recent reviews

Text reviews

Positive

Negative

The extension works, but currently leaks memory on Reddit tabs like there's no tomorrow.

Firefox user 12656799·4 Feb 2026

This extension does what it says it does, and if you use it for a one-time use and then remove it no issue. The issue is that if you decide to keep the extension it will use up all of your memory! It has some sort of leak or lack of optimization that causes it to slow my 32GB DDR5 machine to a crawl. Without this extension only 6GB of use, with this extension all of it can be used!

Firefox user 19601153·29 Nov 2025

This extension was really useful! I had to get cookies for JDownloader lots of times and it worked perfectly. The only problem I've noticed is that the RAM usage goes up the roof with it enabled. Six Reddit tabs open were using 10GB, I don't know if that is a memory leak or just how it works, but I'd advise everyone to leave it disabled. It hasn't been updated since January, perhaps something changed and broke it?

Extension files

Browse and explore files within this extension package

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URLs

IPv4

URLs

View the external URLs this extension communicates with to understand its network activity and data interactions.

No URLs found

No IP addresses found

25 indicators in this extension

25 indicators

0 versions analysed

Every finding is verified by a security analyst. Unlock the code evidence, indicators and version history.

Unlock this report — $4.99 Start 7-day trial — all reports

One-time payment · Secure checkout by Stripe

Version	Size	Verdict	Findings	Permhash
3.1.14 Latest	1.03 MB	Not scanned	—	03cc403b05f047bb9d8c5c4afe3d6f7bdc408a7d35021dfe62ef408cc9d9f19d
3.1.16	1.03 MB	Not scanned	—	03cc403b05f047bb9d8c5c4afe3d6f7bdc408a7d35021dfe62ef408cc9d9f19d
3.2.1	0.33 MB	Not scanned	—	03cc403b05f047bb9d8c5c4afe3d6f7bdc408a7d35021dfe62ef408cc9d9f19d
3.4.0	0.33 MB	Not scanned	—	dc747fb734942a655fbe7ed12592fcd52aed8a91a789c601baf72f2655f2fb2a
3.4.1	0.33 MB	Not scanned	—	dc747fb734942a655fbe7ed12592fcd52aed8a91a789c601baf72f2655f2fb2a
3.5.0	0.33 MB	Not scanned	—	dc747fb734942a655fbe7ed12592fcd52aed8a91a789c601baf72f2655f2fb2a
3.6.0	0.33 MB	Not scanned	—	dc747fb734942a655fbe7ed12592fcd52aed8a91a789c601baf72f2655f2fb2a
3.6.3	0.33 MB	Not scanned	—	0a8247fb71e589a77960b5f7be26d7cd2f6f1095c309a9cf68b0603a2bb9a41e
3.6.7	0.34 MB	Not scanned	—	0a8247fb71e589a77960b5f7be26d7cd2f6f1095c309a9cf68b0603a2bb9a41e
3.6.8	0.34 MB	Not scanned	—	0a8247fb71e589a77960b5f7be26d7cd2f6f1095c309a9cf68b0603a2bb9a41e

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Code Diff

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No comparable text files found between these versions.

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Not reviewed

25 indicators in this extension

What our analysis found

Flag Cookies Firefox extension security report

Extension Info & Metadata

Publisher Contextual Analysis

Screenshots & videos

Install growth

User Growth

Rating Count

Average Rating

Threat relationships

Internal permhash`e3f65c0e62…`
No malicious matches

Permhash (Mandiant)`0a8247fb71…`
No malicious matches

Network indicators

Security analysis

Manifest File Security Analysis

25 indicators in this extension

Store listing & files

About this extension

User reviews

User Reviews

Extension files

Network indicators

URLs

25 indicators in this extension

Versions & changes

Version History

Code Diff

More from Jan Riechers

User Reviews

Threat relationships

Internal permhash`e3f65c0e62…`
No malicious matches

Permhash (Mandiant)`0a8247fb71…`
No malicious matches

Network indicators

User Growth

Rating Count

Average Rating

Not reviewed

25 indicators in this extension

What our analysis found

Flag Cookies Firefox extension security report

Extension Info & Metadata

Publisher Contextual Analysis

Screenshots & videos

Install growth

User Growth

Rating Count

Average Rating

Threat relationships

Internal permhashe3f65c0e62…No malicious matches

Permhash (Mandiant)0a8247fb71…No malicious matches

Network indicators

Security analysis

Manifest File Security Analysis

25 indicators in this extension

Store listing & files

About this extension

User reviews

User Reviews

Extension files

Network indicators

URLs

25 indicators in this extension

Versions & changes

Version History

Code Diff

Related extensions

More from Jan Riechers

User Reviews

Threat relationships

Internal permhashe3f65c0e62…No malicious matches

Permhash (Mandiant)0a8247fb71…No malicious matches

Network indicators

User Growth

Rating Count

Average Rating

Internal permhash`e3f65c0e62…`
No malicious matches

Permhash (Mandiant)`0a8247fb71…`
No malicious matches

Internal permhash`e3f65c0e62…`
No malicious matches

Permhash (Mandiant)`0a8247fb71…`
No malicious matches