I love this add-on so far. It really helps with my college courses, especially since the long texts I need to read get tiring from reading on my own. There are some issues with some pronunciation of words or speaking out the links/references, but nothing that fully interfere with what I need to read.

Good add-on, lots of customization. The default voice is annoying and hard to understand (imo) but there's so many to choose from after opening up the options menu. They are all named, which makes it easier to switch between different ones if you want. There are some silly ones (like "bells" or "bubbles.") and you can adjust the speed and pitch, too.

My only complaint is that it is kinda convoluted to get it to work with PDFs, which is the main thing i was planning on using it for. I'm willing to put in the extra effort, but it is annoying. Especially because I deal with pretty severe brain fog at times, and those are the times I would want to use this. Having to take extra steps when you're already confused as a baseline... it's not fun. Simple is better. If this could be simplified or side stepped, this would get 5 stars from me.

It uses a lot of resources, but it's very good and easy to use. I choose cori-high (UK) English voice and now my PC has a distinctive posh accent :)

Good

The voice isn't amazing at all... but it's good enough until there's a better alternative for firefox

1.68 update is leaving a residue static sound whenever there is text loaded in the extension. This is distracting and making the pause feature unusable for me.

Edit: I tried out older versions and retried the new one and the problem went away. No idea what was causing it. I encountered another bug however with the new "Piper" feature, the extension was not able to load the manager page where you install the voices. It worked on Brave though (I use LibreWolf)

Edit2: Static sound problem came back. I decided to revert back and stay in version 1.66 No longer experience the issue on that version.

Used this for like years to make my novels audiobooks and the desktop browser version of it works pretty well. IMO, the only good TTS voice is the microsoft zira one lol. Works very well for what it is, but the in-built firefox reader also has a TTS function, which is essentially the same thing. I don't discourage people from using this extension though, since it comes in handy when you just need one specific section TTS'd and it's quicker to activate than the in-built one.

An issue I found only on the desktop browser is that the highlighted text would jump ahead of the actual text the extension is reading and it would continue reading the text even if you press 'stop' (only in the case of the jumping highlighted text). Found that if this happens, press 'test' in the settings and the 'stop' after and it'll stop. Kind of annoying though since it happens every so often.

On the other hand, the mobile version of the extension is kinda meh. The issue I mentioned before doesn't seem to exist on mobile but a different one cropped up. On certain sites, or pages within the sites, the TTS randomly decides to change their voice to another. Again, only microsoft zira is listenable so it forces me to just stop the TTS and read manually.

Also, the 'sign in to use premium voices' have never acutally worked for me on mobile. Every time I click 'sign in', nothing appears T_T, lowkey frustrating. And apart from the offline voices, all of the voices don't work when I'm running on data. They do work when I'm using someone elses hotspot tho :(. Frustrating since I usually want to use mobile TTS when I'm out and about.

Please look into NovelAI support.
Some AI Chatbot sites are able to access NovelAI's voice feature when you add their API key, so don't think it should be impossible here.

good add, but sometimes there are flaws

Working , even in Slovak language :).

TL:DR - I personally find MS Zira voice with 75% speed, 100% pitch, to be good enough for most scenarios. Default settings sound horrible, but can be tweaked, that is what I mean.

Okay overall with all things considered, this is currently among the most easy to use TTS (Text to Speech) addons

Pros:
- Easy to use, works fine with a google translated page, easily identifies what you want to read

- You can use Google Wavenet, Amazon Polly & IBM Watson voices with it, if you have API access (all 3 of them have a free tier)

- Has a dark background pop-up that shows the text in a simple readable format alongside speech

Cons:
- Biggest con is that it doesn't use the new Microsoft voices that come with Windows Narrator. It only uses the old Zira, Adam, voices which are of lower quality.

- No way to add a custom Offline voice model. The option of 'Custom Voice is for the online APIs'

- I heard somewhere, that even in offline mode, it does uses some google apis, but haven't checked myself. Given it is recommended by Mozilla officially, I guess its alright for non-security scenarios.

A little more robotic than possible but a lot faster than having to manually copy and paste text into a website which is all I want in an add-on like this. Also allows for speed change which is a plus.

Danke. Einfach nur Danke