CatBlock

Name: CatBlock
Rating: 4.6667 (15 reviews)
Author: catblock-team

By: catblock-team

CatBlock is an ad-blocking extension, which replaces ads with cute pictures of cats (or whatever you want)!

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Features & Capabilities

CatBlock is a unique ad-blocking Chrome extension that replaces intrusive ads with cute pictures of cats or your own chosen images, enhancing your browsing experience with charm and personalization. Originally launched in 2014 and open-sourced under the GPLv3 license, CatBlock has been actively developed by dedicated creators to remain compatible across major browsers including Mozilla Firefox and Microsoft Edge.

Perfect for users who want an ad-free internet while enjoying adorable feline images, CatBlock combines effective ad blocking with a fun twist. Its open-source nature ensures transparency and ongoing improvements. Learn more about its development history and contribute at the official GitHub repository.

User Growth & Download Statistics

Add-on Privacy & Security Entertainment

By:

Daily users:

Rating:

Version:

1.4.10resigned1 Last updated: 2024-04-25

Version code:

5726824

Creation date:

2016-05-18

Risk:

Permissions:

Content scripts matches:

*.mail.live.com
*.mastertoons.com
*.getadblock.com
*.mobilmania.cz
*.zive.cz
*.doupe.cz
*.e15.cz
*.sportrevue.cz
*.autorevue.cz
*.youtube.com

Size:

1.10MB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-10

Compare stats and ranking:

Ranking

# 9,131 ▼ 184

Other rankings

#46 in effort keyword 2 ▼ 1

#55 in education keyword 7 ▼ 4

#77 in catalog keyword 8 ▼ 3

#77 in education keyword 7 ▼ 3

#83 in category keyword 30 ▼ 3

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Other platforms

CatBlock (v1.5.1.1)

2,000 4.59

(56)

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:

catblock-team

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/adblock-with-catblock/

Website:

https://catblock.tenderapp.com

User Reviews

by Av*****, 2025-08-05

Awesome app! Best ad blocker

by Il*****, 2025-06-24

by De*****, 2024-07-11

View all user reviews ›

Is CatBlock 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.

CatBlock requires a lot of sensitive permissions. 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.

CatBlock 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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