I've tried more than 5 different TTS addons, but none of them functioned as well as this one. Both English and Turkish is being read alout quite well and without any hussles. The initiation and ending of the reading is very intiuitive and works just fine.
I definitely suggest trying out this addon.

Esta muy buena la app, se lee rapido y con muchas opciones

This is a excellent add-on. I am Chinese and I can read English but I read very slow. With this add-on, I can read faster and can understand some of the words I do not know. The add-on also give us a lot of voice choices including man and woman voice.

The TTS (multi-language tts) worked well enough but stopped reading PDFs as FF was updated and the developer perhaps gave up. This add-on reads my PDFs beautifully and all the controls work perfectly. Thank you. Thank you.

Great usability. Amazon voice "Kimberly" sounds the best to me. Very listenable.

Yeah i like how it highlights. This Text to speech FF addon is awesome!!! Yay!

This is an awesome addon and is free/libre software

Xài quá tốt luôn

Fantastic.

So good! highly recommended!

Simple to use, just select your webpage text (including web-based emails), right click and click on "read aloud". Excellent choices of voices in the settings as well. A great and useful tool, definitely a keeper! Many thanks!

App simples! Voz bem sintetezida!

Works well. I use Alex and slowed the natural speed down a bit and it's perfect! Please keep it up!