On the first screen of "trending ideas", this was the only one that caught my interest. The list appears to be pretty random, but it appears to be a combination of being a recent submission and receiving the (dismissive) "terminal comment" from the "Community Manager" Jon.
However, the reason it caught my attention was not related to Firefox. It was because I use the flip-side feature, voice dictation, quite heavily in Android and I've been struggling with the TTS side since "upgrading" to a new smartphone. (Samsung has disappointed me a second time. Shame on me, though I have excuses. Or maybe I should just blame Oppo?)
However, I can pretty definitely say that I would not chip in $10 towards adding this particular feature within Firefox. That's again on the premise that Firefox had a different donation model where I could direct at least some of my donations towards the features I am using or want to use... My tag for that idea is #CSB (but there are no matches, though I thought I submitted that suggestion a couple of years ago). In general I don't use Firefox on Android because it is too heavy and making it heavier is not going to help. The main feature I do use which calls for (ongoing) donations involves sync (but only two parts).