Is already in the list 
Sorry, missed that.
I just gave IBrowse v.2.5.8 another test.
Still doesnt work, but almost. This time it does start and loads the about: page into the browser window, but a second later a software failure requestor pops up. It refers to line 1111, emulator/co-processor error
(I did select the non FPU / 020 version during install)
I suspect that MUI is part of the problem. Without MUI installed it never really starts, just en error requestor 'could not create CL_URLString'
I did install first MUI3.8. (had to comment one line in startup-sequence 'assign add HELP: MUI:Docs' to get AMiBench to load)
Starting over, but now tried using MUI 5.0 (2021 release) but then I got the same requestor as when not having MUI at all.
A side effect of installing MUI is that certain AmiBench features will fail, like icon info.
Another test, MUI3.8 again. Now during install I selected 'No, do not delete' when asked to delete mui stuff not needed
Now Icon Info will work just fine. Reinstalling IBrowse, and now the window loads without any software failure messages. But the window is totally empty som something is not rendering correctly. Title menu works, so I was able to close Ibrowse without errors.
If I had the patience to try repeat the test x number of times I would try to let the MUI installer delete some parts, but not all. And then maybe find a combination that actually loads Ibrowse correctly without software errors.