Firefox Add-ons

11Versions

0Code reviewed

Not reviewed

No code review on record

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17 indicators in this extension

17 indicators

0 versions analysed

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What our analysis found

Knockoff - Amazon & Etsy Shopping Filter, used by 18,370 people, is not yet reviewed by Extension Auditor. Its permissions mean it can inject scripts into pages. It comes from a publisher with 2 extensions and was last updated in August 2026.

Knockoff - Amazon & Etsy Shopping Filter Firefox extension security report

ID: knockoff-amazon-brand-filter

Extension Info & Metadata

Status

Active

Version

1.4.0

Size

0.36 MB

Rating

3.8/5

Reviews

Users

18,370

Type

Extension

Updated

Aug 13, 2026

Publisher Contextual Analysis

Author: Ordinary Systems
Privacy: Privacy Policy
Country: US
MX records exist: Yes
Domain exists: Yes
Is disposable: No
Is role-based: No
Mailbox exists: Yes
Address: 16700 US-280 STE A 208 Chelsea, AL 35043 US
Website: Visit

Extensions

Active

Obsolete

Listed

Unlisted

Users

39,709

Email Change History

1 change

Jul 16, 2026

Domain changed

Screenshots & videos

Install growth

User Growth

Showing data from Jul 09, 2026 to Sep 30, 2026

Versions

+123041.18%(+20,917 users)

Compared to 3 months ago

14 versions released in this period

Rating Count

Total: 57 ratings+1 (2%)

Average Rating

Current: 3.56 / 5.0-1.06

See plans

React Flow

Internal permhash`e14483e97b…`
9 malicious

96 other extensions carry this fingerprint; 9 of the cluster are known malicious.

Withheldmalicious
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+89 more

Permhash (Mandiant)`efdfdecb64…`
Too common to be evidence

3,008 other extensions carry this fingerprint, 185 of them known malicious. A permission set this common is not evidence on its own; the most installed members are listed for reference.

Withheldmalicious
Withheldmalicious
Withheldmalicious
Withheldmalicious
Withheldmalicious
Withheldmalicious
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+3,001 more

Network indicators

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

Item	Type	Severity	Description
scripting	Permission	Critical	This permission allows injection and execution of JavaScript on any webpage. Rated Critical because it can modify page content, steal sensitive data, and inject malicious code into any site the extension has access to.
Contextual Risk Factors	Risk Factor	High	The following context increases the overall risk:• 20% increase: Access to sensitive domains increases potential impact• 10% increase: Early script execution enables pre-emptive content manipulation
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.
Access to Sensitive Domains	Risk Factor	Medium	This extension requests access to sensitive domains: https://www.amazon.com/, https://www.amazon.ca/, https://www.amazon.com.mx/, https://www.amazon.com.br/, https://www.amazon.co.uk/, https://www.amazon.ie/, https://www.amazon.de/, https://www.amazon.fr/, https://www.amazon.it/, https://www.amazon.es/, https://www.amazon.nl/, https://www.amazon.se/, https://www.amazon.pl/, https://www.amazon.com.be/, https://www.amazon.com.tr/, https://www.amazon.ae/, https://www.amazon.sa/, https://www.amazon.eg/, https://www.amazon.co.za/, https://www.amazon.in/, https://www.amazon.co.jp/, https://www.amazon.sg/, https://www.amazon.com.au/*
Early Content Script Execution	Risk Factor	Medium	This extension runs content scripts at document_start.

Sensitive Domain Access

This extension has access to the following sensitive domains:

https://www.amazon.com/*
https://www.amazon.ca/*
https://www.amazon.com.mx/*
https://www.amazon.com.br/*
https://www.amazon.co.uk/*
https://www.amazon.ie/*
https://www.amazon.de/*
https://www.amazon.fr/*
https://www.amazon.it/*
https://www.amazon.es/*
https://www.amazon.nl/*
https://www.amazon.se/*
https://www.amazon.pl/*
https://www.amazon.com.be/*
https://www.amazon.com.tr/*
https://www.amazon.ae/*
https://www.amazon.sa/*
https://www.amazon.eg/*
https://www.amazon.co.za/*
https://www.amazon.in/*
https://www.amazon.co.jp/*
https://www.amazon.sg/*
https://www.amazon.com.au/*

17 indicators in this extension

17 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

About this extension

Filters pseudo-brand junk out of Amazon, checks if Etsy listings are really handmade, hides sponsored listings.

User reviews

2.1 out of 5 · 10 most recent reviews

Text reviews

Positive

Negative

Pulled a bait-and-switch from being open-source to being a closed-source "enterprise" subscription product. I wouldn't say it's necessarily spyware like the other reviews are claiming; Firefox addon permissions are finicky. But advertising as open-source, getting a bunch of articles written about it, and then switching to closed source with paid options... it leaves a very bad taste in my mouth. It gained popularity as being community driven, like uBlock. Now it will likely die off. In any case, I'm no longer using it.

MagmaMaineCoon·4 Sept 2026

TURNED PRIVATE AND TO SPYWARE

SquazelSquintz·30 Aug 2026

Extension files

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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

17 indicators in this extension

17 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
0.3.0 Latest	0.08 MB	Not scanned	—	49a25f9feefaffecad0fcd30c50dc9331cff8b55ece53def6285c09e17e6f5d7
0.4.0	0.09 MB	Not scanned	—	49a25f9feefaffecad0fcd30c50dc9331cff8b55ece53def6285c09e17e6f5d7
0.5.0	0.10 MB	Not scanned	—	49a25f9feefaffecad0fcd30c50dc9331cff8b55ece53def6285c09e17e6f5d7
0.7.2	0.11 MB	Not scanned	—	49a25f9feefaffecad0fcd30c50dc9331cff8b55ece53def6285c09e17e6f5d7
0.8.0	0.12 MB	Not scanned	—	49a25f9feefaffecad0fcd30c50dc9331cff8b55ece53def6285c09e17e6f5d7
0.9.0	0.21 MB	Not scanned	—	49a25f9feefaffecad0fcd30c50dc9331cff8b55ece53def6285c09e17e6f5d7
0.10.0	0.22 MB	Not scanned	—	49a25f9feefaffecad0fcd30c50dc9331cff8b55ece53def6285c09e17e6f5d7
0.11.0	0.22 MB	Not scanned	—	49a25f9feefaffecad0fcd30c50dc9331cff8b55ece53def6285c09e17e6f5d7
1.2.0	0.35 MB	Not scanned	—	efdfdecb64ab692a10a22159e6e03f859fc20a5c297c4a788c3c2248783eb0f9
1.3.1	0.36 MB	Not scanned	—	efdfdecb64ab692a10a22159e6e03f859fc20a5c297c4a788c3c2248783eb0f9

Showing 1 to 10 of 20 rows

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Code Diff

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0 changed files detected

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Not reviewed

17 indicators in this extension

What our analysis found