Earlier quoted context omitted.
I worry that desktop Firefox will go the way of the Android version or the neutered Firefox OS browser, where you cannot install the vital security add-on NoScript due to the incompatible add-on model that the mobile versions use. That used to work on Android, but no longer (and it seems the noscript dev is not a fan of the mobile platform). There are many more add-ons that only work on the desktop version. They shou…
The problem is that most existing extensions are based on XUL, which is terrible and impractical for good mobile UIs. There is a more abstract addon API (used by restartless addons) and your favourite ones just need to be updated. Also, NoScript is not a "vital security add-on".
The vast majority of exploits depend on JS being available, since (at the very least) it'll be used to unobfuscate/execute some attack code. Remember the Tor browser vulnerability that was exploited? That wouldn't have happened without JS.
(Coincidentally, I find it amusing that not too long after, that Firefox made it even harder to disable JS, by removing the checkbox for global enable/disable.)