While testing some APZ stuff, I found it to be pretty easy to OOM Fennec by panning/zooming a bunch on a desktop page (nytimes.com in this case). A little digging indicates that we are creating more MemoryTextureHost instances than we are freeing, and thus leaking (or retaining?) the buffers.
Upon closer inspection it looks like we're just retaining these, and it's actually another case of bug 1223479
Created attachment 8688159 [details] [diff] [review] Use more reasonable APZ multipliers on mobile