I'm using Aweb 3.5.9 beta in my 3.1 setup. Slow as hell, but fully functional. Images and javascript plug-ins seem to require an FPU, as they work OK in my A1200 with Blizzard 030 MKIV and FPU but crash the whole machine in my 3.1 FPU-less ACA630 accelerated Amiga 600. Turning those plug-ins off solved the issue, but I'd like to take a look at Ibrowse anyway.
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yeah, aweb crashes on my 3.1 machine if images are enabled.
WIth them disabled, its pretty quick.
Ibrowse seems to play nicer with that stuff, though its a bit pokey on my 030. Fully usable though, and its nice to have the option.