Firefox Add-ons

2Versions

0Code reviewed

Not reviewed

No code review on record

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1 indicator

0 versions analysed

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What our analysis found

WebP / Avif image converter, used by 16,721 people, is not yet reviewed by Extension Auditor. Its permissions mean it can read and change data on all websites. It comes from a trusted publisher and was last updated in June 2024.

WebP / Avif image converter Firefox extension security report

ID: webp-image-converter

Extension Info & Metadata

Status

Active

Version

1.3.1

Size

0.05 MB

Rating

3.9/5

Reviews

129

Users

16,721

Type

Extension

Updated

Jun 20, 2024

Publisher Contextual Analysis

Trusted

Author: Nullbrains
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

37,058

Screenshots & videos

Install growth

User Growth

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

Versions

-1.98%(-339 users)

Compared to 3 months ago

2 versions released in this period

Rating Count

Total: 113 ratings

Average Rating

Current: 3.94 / 5.0-0.11

See plans

React Flow

Internal permhash`9beda86f1f…`
3 malicious

11 other extensions carry this fingerprint; 3 of the cluster are known malicious.

Withheldmalicious
Withheldmalicious
Withheldmalicious
Withheldnot flagged
Withheldnot flagged
Withheldnot flagged
Withheldnot flagged
+4 more

Permhash (Mandiant)`1f17ee5863…`
No malicious matches

4 other extensions carry this fingerprint, none of them known malicious.

Withheldnot flagged
Withheldnot flagged
Withheldnot flagged
Withheldnot flagged

Network indicators

1 URLs and 0 IP literals were extracted from this version.

Item	Type	Severity	Description
<all_urls>	Host	Critical	Broad host access — the extension can read/modify content on every website.
file:///*	Risk Factor	Critical	This permission grants access to all websites without restriction. Rated High because it can access any web content, monitor all web activity, and potentially steal sensitive data across all sites.
downloads	Permission	High	This permission controls file downloads and accesses download history. Rated High because it can download malicious files, access sensitive downloaded documents, and track user download patterns.
Contextual Risk Factors	Risk Factor	High	The following context increases the overall risk:• 10% increase: Early script execution enables pre-emptive content manipulation• 15% increase: Older manifest version lacks modern security controls
Broad Host Permissions	Risk Factor	High	This extension has broad host permissions allowing it to access many or all websites.
Broad Content Script Access	Risk Factor	High	This extension can inject scripts into any website.
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.
Early Content Script Execution	Risk Factor	Medium	This extension runs content scripts at document_start.
Older Manifest Version	Risk Factor	Medium	This extension uses Manifest Version 2
contextMenus	Permission	Low	This permission adds items to browser context menus. Rated Medium because it only modifies right-click menus without access to page content.

1 indicator

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

Convert WebP, Avif and other image types before saving and store them in an orderly fashion. All based on your preferences and fully automatic. Simply right click on an image and use the "Convert and save as" button. More details in the description.

User reviews

3.4 out of 5 · 10 most recent reviews

Text reviews

Positive

Negative

Very good!

Projetos Euro Parts Brasil·30 Jun 2026

Crunches resolution of images something fierce, turned text from crisp to illegible

Firefox user 18808291·25 Nov 2025

Works like a charm, as far as I am concerned. At first, I thought it was a shame it saved the image in .png but I then realised that plenty of options are available in the extensions parameters. Marche à merveille, en ce qui me concerne. Au début je trouvais dommage que l'image soit enregistré en .png pour ensuite réaliser que pleins d'options sont disponibles dans les paramètres de l'extension.

Extension files

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URLs

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

No URLs found

No IP addresses found

1 indicator

0 versions analysed

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

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Version	Size	Verdict	Findings	Permhash
1.2.10 Latest	0.05 MB	Not scanned	—	1f17ee58636c77c555c396b97b9585edd053cc39f9d1a4c58092c9583e1df56f
1.3.1	0.05 MB	Not scanned	—	1f17ee58636c77c555c396b97b9585edd053cc39f9d1a4c58092c9583e1df56f

Showing 1 to 2 of 10 rows

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Code Diff

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0 changed files detected

No comparable text files found between these versions.

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Not reviewed

1 indicator

What our analysis found