In the reader mode, when I click the "Narrate" and play, only first paragraph will be read. The wave icon is moving, a speaker shows on tab, but no more voice came out. It looks like a crash but happens all the time. Also, I tried chirpy and got same problem. Is there some setting wrong on my browser? The MacOS version is 10.13.4; Firefox version 52.8.0 (64-bit) on ESR update channel. I mistakenly posted the same question on the wrong forum before. Here is the link: https://support.mozilla.org/en-US/questions/1217053. Hope it helps. Thanks!