Actually I think you're right, and in fact they've already done this for those of us who used Firefox Nightly on Android. I had both Nightly and Preview on my p

Actually I think you're right, and in fact they've already done this for those of us who used Firefox Nightly on Android. I had both Nightly and Preview on my phone, and kept using Nightly precisely because it supported all my extensions (Cookie AutoDelete, Bypass Paywall etc). One morning I woke up to see that Nightly was "upgraded" to Preview, and my extensions (except uBlock) were disabled. From what I understood, it seems like the same is going to happen with the stable branch - first it'll be "upgraded" to Preview and only later Preview will get all extensions support. Another bitter thing about this is that as much as the new Preview UI is slicker, it's actually browsing noticeably slower on my Google Pixel.