It works, but it's not what I expected. I'm using Firefox for Android on a Samsung Galaxy Note 10+.

In order to have text read aloud, you need to either highlight text yourself or just be on the page you want read (in its entirety, with all headings & image description text, etc) and then you trigger the add-on in the browser's vertical elipsis menu (or is it a skinny hamburger?). Then, you will be in a totally new tab with only the text from the page and a pause/play and settings button.

I was hoping the "popup" option under this addon's settings would allow me to just highlight some paragraphs I want read, for instance, long-press it and be able to choose "read aloud" or something like that. Maybe I'd even see a tiny popup once triggered with the pause/play controls or it would be in the toolbar.

I ran into the issue that I couldn't get the voice to stop talking after pressing stop, changing tabs, and even closing Firefox (had to kill Firefox manually in my phone's "app info"). It would be great to be able to hear the reading after leaving a tab, but the ability to pause & start again are obviously important as well.