This would have been perfect for iPad 2's and 3's on which Safari and the normal Firefox keep crashing under the weight of the current bloated web.
But alas, the "simple and lightweight" Firefox Focus actually requires a heavyweight 64-bit processor:
> Why aren't older Apple products supported? Safari Content Blockers (which include Firefox Focus) are only available on devices with an A7 processor (64-bit) or later. Only 64-bit processors can handle the extra load of content blocking, which insures optimal performance. For example, since the iPad 3 has an A5 processor, Firefox Focus is incompatible.[1]
Come on, iPad 2's and 3's are less than 5 years old. There has to be some way to keep the iPad 2 or 3 alive if all you want to do browse the web.