Firefox Browser Add-ons
Log in
Preview of Custom TTS Reader

Custom TTS Reader by BassGaming

TTS implementation for the OpenAI api format. It can probably be used for any OpenAI api compliant service but its made for remsky/Kokoro-FastAPI. Click 'Read Selected Text' in the context menu after highlighting text.

4.8 (5 reviews)4.8 (5 reviews)
100 Users100 Users
You'll need Firefox to use this extension
Download Firefox
Download file

Extension Metadata

Screenshots
Custom TTS Reader Options - PCCustom TTS Reader Options - Mobile
About this extension
Do you have your own OpenAI-compatible Speech endpoint running and want to use it in Firefox?
This is a TTS implementation for the OpenAI API format. It can probably be used for any OpenAI api compliant service but its made for remsky/Kokoro-FastAPI.

Click 'Read Selected Text' in the context menu after highlighting text.

You can change the API URL, API key, speed and voice by clicking the extension icon in the toolbar.
If no checkbox is checked, it will generate the whole audio before starting playback.
The streaming mode is the prefered way of using the extension. Credits to rampadc for fixing the code.
The download mode will provide an mp3 file.

Since you can host your own speech endpoint, privacy and accessibility are as good as the service you're running.

Github: https://github.com/BassGaming/customtts

Personally I recommend using Kokoro FastAPI in a docker container:
https://github.com/remsky/Kokoro-FastAPI/

Android:
To read text: Mark text -> click the three option dots -> Extensions -> Custom TTS Reader
To access settings: Click the three option dots -> Extensions -> Extension Manager -> Custom TTS Reader -> Settings

Note:
This is just a quick implementation since I couldn't find a similar extension where you could use your own API endpoint anywhere. Feel free to improve it... or not
Rated 4.8 by 5 reviewers
Log in to rate this extension
There are no ratings yet

Star rating saved

5
4
4
1
3
0
2
0
1
0
Read all 5 reviews
Permissions and dataLearn more

Required permissions:

  • Download files and read and modify the browser’s download history
  • Access browser tabs
  • Access your data for all web sites
More information
Add-on Links
  • Support site
Version
1.4
Size
33.36 kB
Last updated
22 days ago (17 Jul 2025)
Related Categories
  • Language Support
Licence
MIT Licence
Version History
  • See all versions
Tags
  • chat
  • mp3
  • privacy
Add to collection
Report this add-on
Release notes for 1.4
Added Download Mode.
You can now save the mp3 audio locally.
More extensions by BassGaming
  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

Go to Mozilla's homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Browsers

  • Desktop
  • Mobile
  • Enterprise

Products

  • Browsers
  • VPN
  • Relay
  • Monitor
  • Pocket
  • Bluesky (@firefox.com)
  • Instagram (Firefox)
  • YouTube (firefoxchannel)
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike Licence v3.0 or any later version.