# CatBlock

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

Canonical page: [https://chrome-stats.com/d/adblock-with-catblock](https://chrome-stats.com/d/adblock-with-catblock)

## Overview

- **ID:** `adblock-with-catblock`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** catblock-team
- **Category:** privacy-security
- **Daily users:** 165
- **Weekly downloads:** 9
- **Rating:** 4.67 / 5 (15 ratings)
- **Version:** 1.4.10resigned1
- **Last updated:** 2024-04-25
- **First published:** 2016-05-18
- **Size:** 1.10 MB
- **Data as of:** 2026-09-11
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/adblock-with-catblock/)
- **Website:** [https://catblock.tenderapp.com](https://catblock.tenderapp.com/)

## Description

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.

## Rankings

- #9,034 — Overall
- #47 — effort
- #54 — education
- #73 — catalog
- #75 — education
- #83 — category

## Permissions and access

### Permissions

- `http://*/*`
- `https://*/*`
- `contextMenus`
- `tabs`
- `idle`
- `webRequest`
- `webRequestBlocking`
- `webNavigation`
- `alarms`
- `storage`
- `notifications`

### Content script matches

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

## Safety

- **Risk impact:** Very high risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/adblock-with-catblock)