In case anyone scrolls to the end of this thread looking for solutions, I
mentioned in a reply further up that if I tick the checkbox in ABrowser
settings to allow websites to choose their own custom fonts, the display
problem is resolved for Minds.com. This also seems to resolve the display
problems I was having with Movim instances, and with fediverse.party. For
more details on this fix, see:
https://gitlab.com/minds/front/issues/918#note_165695949
The Wire web app is working again now, on both 32-bit and 64-bit ABrowser.
The issue there seems unrelated, as I toggled custom fonts off again and
reloaded, and it seemed to make no difference.
The only other free code server software I still couldn't get working in
ABrowser was CryptPad (https://cryptpad.fr/), even with all its domains set
to 'trusted' in NoScript and uBlock Origin turned off. CryptPad seems to be
working in the 64-bit ABrowser, but its demands on both CPU and RAM are
*very* high and the system running 32-bit ABrowser doesn't seem to be able to
cope with it. This may have been the problem all along.