Gracias por tu aporte, en nombre de los que usamos GNU/Linux te lo agradecemos.

Couldn't find less than one star. Sorry honest as I could be

Tốt

4⭐> Back to 5⭐. Dev posted latest fixes addressing (my issue) W/
The Piper voices. Such a great addition.
BUT, I need a slower read Spd. Prior if changing Spd < or > it would change "hfc_female_voice[medium] ENGLISH_US" to different voice entirely. Submitted feedback and noticed today a posted fix!
not sure why ppl are giving bad reviews for "synthesized voices" make sure to accept/grant ALL permissions. Also, create an acct. and log in.
They're much better now.
A fantastic app extension that I use multi times, daily.
THANK YOU for, what I can only imagine, is hard work, FREE of charge, to bring the masses a fantastic extension. Not to Mention (AFAIK) the ONLY 1 for Our Beloved FireFox
Alas, ppl still complain.
On Android now, and it works actually better than Windows 10.
Thanks Again!

anda muy bien, gracias

Android version. Couldn't get it to work. Fresh Firefox install from Play Store, no other add-ons installed. Selected it in the add-ons section of the Firefox menu and am informed that it needs more permissions to talk to Google. I click the grant button and nothing happens. I click the permissions link and nothing happens. Spent an hour researching and trying different things, nothing works. I'm removing it, likely permanently.

Works on PC and Firefox Nightly on Android. Thank you!

It kept reading the same paragraph over and over again, so I tried to stop it !
I pressed stop-
Ishut down Firefox-
I closed every window-
I couldn't get it to stop-
Finally I had to restart my phone. That worked ツ

Read Aloud might be a serious add-on for desktop Firefox, but, frankly, it's implementation in Firefox for Android 🦊 is pretty lousy if not useless:
1) There is only one very robot-ish (female) voice per language!
2) The UI within Firefox is more than pathetic!
3) There are no Android notification center controls!
4) When quitting Firefox, it just continues reading aloud!

In contrast, Mozilla's Pocket for Android is really convincing with a choice of ~10 great TTS voices per language, sounding very natural & pleasant like a radio announcer.

IOW: back to the workbench, developers!

I was not able to run it even once, because it kept asking me to sign in for using premium voices. This was with the default settings.

Voice is very bad (very robotic). Difficult to understand.
Few weeks ago I guess I have tried old version and voice was very good. But now it is very bad compared to one I tried before.