MessPostage

Name: MessPostage
Rating: 5 (2 reviews)
Author: Sjoerd Langkemper

Notify user of postMessage messages and event handlers. This is helpful during debugging or security testing of a web application.

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Features & Capabilities

MessPostage is a Chrome extension designed to notify users when postMessage communications occur between windows or iframes in a web application. This tool is especially useful for developers and security testers who need to track and debug message passing events typically handled by the postMessage API. By providing real-time notifications of messages and associated event handlers, MessPostage helps improve the visibility into cross-origin communication, enhancing both debugging efficiency and security analysis during development.

With MessPostage, users gain an easy-to-use interface that alerts them whenever a postMessage event is triggered. This extension is essential for web developers looking to monitor and verify message exchanges between different domains within their apps, ensuring proper data flow and reducing vulnerabilities.

User Growth & Download Statistics

Add-on Developer Tools Privacy & Security

By:

Daily users:

Rating:

Version:

0.0.8resigned1 Last updated: 2024-04-26

Version code:

5731729

Creation date:

2018-08-28

Risk:

Permissions:

webNavigation

Content scripts matches:

<all_urls>

Size:

27.47KB

URLs:

Website

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-18

Compare stats and ranking:

Ranking

# 11,415 ▼ 489

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Sjoerd Langkemper

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/messpostage/

Website:

https://github.com/Sjord/messpostage

User Reviews

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by Ga*****, 2022-12-25

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Is MessPostage Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

MessPostage requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

MessPostage has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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