CastReader — Read Aloud + AI Explain

Name: CastReader — Read Aloud + AI Explain
Rating: 3.3333 (3 reviews)
Author: CastReader

Read Kindle, PDFs, articles and books aloud with synced highlights. AI explains difficult passages. Natural voices in 8 languages.

Overview

Firefox Add-ons Store

Daily users

233 ▲ 7

Data as of 2026-09-14

Rating:

3.33

(3)

Version:

1.2.42

Last updated: 2026-09-13

Features & Capabilities

CastReader makes long-form reading easier with natural text-to-speech, synchronized word and paragraph highlights, and automatic scrolling. Listen to webpages, articles, PDFs, Word files, text files, books, and Kindle Cloud Reader content while keeping the original text and layout in view. Click any paragraph to resume reading, adjust playback speed, and choose from available voices.

Use AI Explain to understand difficult passages directly on the original page without replacing the source text. CastReader automatically extracts main content while skipping navigation and ads, and supports English, Mandarin Chinese, Japanese, Spanish, French, Brazilian Portuguese, Italian, and Hindi. The free plan includes daily read-aloud and AI Explain limits, while Pro adds unlimited listening and explanations, faster playback, and additional premium voices. Text is processed only when requested, with anonymous analytics that exclude page content and personal information.

User Growth & Download Statistics

Add-on Accessibility AI Books Education Writing

By:

Daily users:

Rating:

Version:

1.2.42 Last updated: 2026-09-13

Version code:

6482448

Creation date:

2026-03-16

Firefox add-on GUID:

castreader@castreader.ai

Firefox add-on numeric ID:

2990224

Weekly download count:

Firefox on Android:

Risk:

Permissions:

activeTab
storage
scripting
contextMenus
alarms
*://api.castreader.ai/*
*://api.castreader.cn/*
*://quickread.castreader.cn/*
*://castreader.ai/*
*://*.cos.accelerate.myqcloud.com/*

Content scripts matches:

<all_urls>
docs.google.com
*.ireader.com.cn
ireader.com.cn
leer.amazon.com.mx
leer.amazon.es
leggi.amazon.it
ler.amazon.com.br
lesen.amazon.de
lezen.amazon.nl

Size:

13.92MB

Email:

su*****@castreader.ai

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-09-14

Compare stats and ranking:

Ranking

# 7,687 ▲ 67

Other rankings

#331 in Language Support ▲ 2

#25 in kindle keyword 35

#106 in reader keyword 62 ▼ 1

#113 in ai keyword 87 ▼ 2

#122 in booking keyword 29

Upgrade to see more rankings

Other platforms

CastReader — Text to Speech, Read Aloud + AI Explain (v1.2.42)

3,000 4.72

(76)

For Developers

Monetize with App Pass Boost with Extension Booster

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:

CastReader

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/castreader-tts-reader/

Email:

su*****@castreader.ai

Website:

https://castreader.com/

Permission Change History

2026-09-07: Version 1.2.36 → 1.2.37

Add Permissions: https://zqxgmqygirtpttnrvjpf.supabase.co/*

2026-08-30: Version 1.2.28 → 1.2.31

Add Permissions: *://api.castreader.cn/* *://quickread.castreader.cn/*

2026-08-01: Version 1.2.22 → 1.2.25

Add Permissions: https://read.amazon.com/* https://read.amazon.co.uk/* https://read.amazon.ca/* https://read.amazon.com.au/* https://read.amazon.co.jp/* https://lesen.amazon.de/* https://read.amazon.de/* https://lire.amazon.fr/* https://read.amazon.fr/* https://leggi.amazon.it/* https://read.amazon.it/* https://leer.amazon.es/* https://read.amazon.es/* https://read.amazon.in/* https://ler.amazon.com.br/* https://read.amazon.com.br/* https://leer.amazon.com.mx/* https://read.amazon.com.mx/* https://lezen.amazon.nl/* https://read.amazon.nl/* https://read.amazon.cn/*

Remove Permissions: *://read.amazon.com/* *://read.amazon.cn/* *://read.amazon.co.uk/* *://read.amazon.ca/* *://read.amazon.co.jp/* *://read.amazon.de/* *://read.amazon.fr/* *://read.amazon.it/* *://read.amazon.es/* *://read.amazon.in/* *://read.amazon.com.br/* *://read.amazon.com.mx/* *://read.amazon.com.au/* *://read.amazon.nl/* *://read.amazon.se/* *://read.amazon.com.tr/* *://read.amazon.ae/* *://read.amazon.sg/* *://read.amazon.pl/* *://read.amazon.eg/* *://read.amazon.sa/* *://leer.amazon.es/* *://ler.amazon.com.br/*

2026-07-16: Version 1.0.2 → 1.2.16

Add Permissions: contextMenus alarms *://api.castreader.ai/* *://castreader.ai/* *://*.cos.accelerate.myqcloud.com/* *://weread.qq.com/* *://www.youtube.com/* *://read.amazon.com/* *://read.amazon.cn/* *://read.amazon.co.uk/* *://read.amazon.ca/* *://read.amazon.co.jp/* *://read.amazon.de/* *://read.amazon.fr/* *://read.amazon.it/* *://read.amazon.es/* *://read.amazon.in/* *://read.amazon.com.br/* *://read.amazon.com.mx/* *://read.amazon.com.au/* *://read.amazon.nl/* *://read.amazon.se/* *://read.amazon.com.tr/* *://read.amazon.ae/* *://read.amazon.sg/* *://read.amazon.pl/* *://read.amazon.eg/* *://read.amazon.sa/* *://leer.amazon.es/* *://ler.amazon.com.br/* *://docs.google.com/* <all_urls>

Remove Host permissions: *://api.castreader.ai/* *://castreader.ai/* *://weread.qq.com/* *://read.amazon.com/* *://read.amazon.cn/* http://localhost:18789/* http://localhost:18790/*

User Reviews

nice

by Fi*****, 2026-08-11

by Ma*****, 2026-07-15

View all user reviews ›

Is CastReader — Read Aloud + AI Explain 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.

CastReader — Read Aloud + AI Explain 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.
Critical ******* ****** ** *** ********* ******** ************** ************** ************* ************ ******* ************ *********** ****** ********** ******* ****** ********** ********** ********** ********** ********** ******* ******* ********** ********** *********** ******* *************** ********
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****

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.

CastReader — Read Aloud + AI Explain is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
High **** ********* *** *** **** ****** ********* ********** *** *** ** ****** ** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
Good **** ********* *** **** **** *******