Performance Map

Name: Performance Map
Rating: 5 (6 reviews)
Author: Francesco De Stefano

By: Francesco De Stefano

Heatmap of resources loaded in the browser using the Resource Timing API

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Install

Features & Capabilities

PerformanceMap: front-end performance heatmap

Add-on to create a front-end performance heatmap of resources loaded in the browser using the Resource Timing API.

Usage

Wait for a page to fully load and then click WebExtension icon to overlay a performance heatmap.

The heatmap colours and the first ms value indicate at what point in the page load the image finished loading. It's a good indicator of user experience... "It took 3450ms before the user saw this image." The second value in brackets is the time it took the browser to load that specific image.

The legend attached to the bottom of the page shows timings for the full page load and hovering over a coloured area on the heatmap will move the timeline indicator to show you when that image was fully loaded.

Credits

It is based on open source project - https://github.com/zeman/perfmap

User Growth & Download Statistics

Add-on

By:

Daily users:

Rating:

Version:

1.2.0 Last updated: 2019-05-15

Version code:

4365578

Creation date:

2019-05-15

Risk:

Permissions:

tabs
activeTab
http://*/*
https://*/*

Size:

14.25KB

Email:

ul*****@mediamaster.eu

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-17

Compare stats and ranking:

Ranking

# 16,688 ▲ 316

Other rankings

#7 in performance keyword 18

#49 in google maps scraper keyword 40 ▼ 1

#65 in format keyword 13 ▲ 4

#84 in resource keyword 28

#98 in map keyword 21 ▲ 2

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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:

Francesco De Stefano

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/performance-map/

Email:

ul*****@mediamaster.eu

Is Performance Map 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.

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

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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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.

Performance Map 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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