Works great for me on Android, I use the plugin to hear texts in English and Spanish, very convenient. The add-on does not appear all the time on the page like other add-ons, which allows you to browse comfortably, for your needs, simply click on the icon of the add-on from the add-ons menu and a player appears at the bottom of the page, and this way you can read the whole page or mark where to start for the reader if you don't want the whole page, for me It's an improvement in quality of life =]

There are a few quirks e.g. it doesn't read last paragraph and the controls don't scale well with custom font size but it does actually work and is faster and doesn't leave out random stuff like Google's own Reading Mode.

期待通りに動いてくれている時は良いアドオンだが、同じページの中で期待通りに動かなくなることがある。読み上げの最中に先の段落をクリックしても読み飛ばしてくれないことがある（正常に動くこともある）。どこを読んでいるのかわからなくなる。他にも多数、謎の動きをすることがある。

Unfortunately it does not work on Twitter home timeline, which would be tremendously helpful! FoxScroller can scroll the timeline even past page reloads and in the background, but has no text-to-speech.