Abrowser 72.0.1 won't load after update.

I am also having this same problem.

I've just used Abrowser 72 on a fresh Trisquel 8 install and an old one, on different machines, but it worked both times.
Did you try to delete Abrowser's config and cache files, to check if some old plugin or setting is the problem?
Alternatively, does Midori (the default browser on Trisquel Mini) work for you? (After installing, if necessary)

I just upgraded and experienced the same issue. Since liberpoolesque reported that Abrowser 72 works with a fresh install of Trisquel, I suspected that there has been some non-backward-incompatible change in Firefox making older profiles invalid. I ran

$ mv .mozilla/abrowser .mozilla/abrowser~

so that Abrowser would not be able to find my profile, after which Abrowser started normally, creating a new default .mozilla/abrowser.

Unfortunately this loses all user bookmarks, history, settings, etc. It should be possible to copy any important data from .mozilla/abrowser~ to .mozilla/abrowser, but it would be preferable to know exactly what about the older profiles is cause the issue so that we can just fix that. I'll look into this more later today.

I found that it was the "network.captive-portal-service.enabled" setting
that cause the segfault for me. Editing ~/.mozilla/abrowser/user.js (if
you don't have user.js, edit prefs.js instead) and changing this setting
from 'true' to 'false' fixed the issue for me.

quidam was unable to replicate this issue by setting that value to
'true', so it seems that it is not this setting alone that causes the
problem, but rather a combination of this setting and at least one
other. However, until we uncover the real problem, setting
network.captive-portal-service.enabled to 'false' may be the best
temporary workaround for users experiencing this issue.

Kinda off-topic, but what do people here think about pale moon? It's a fork of firefox esr, but they plan on keeping the javascript implementation up to date, but not support web rtc. Is there freedom concerns? If so, is there a GNUified version? It feels pretty fast on my T400. I didn't like the build of midori or abrowser bundled with the Trisquel 9 testing branch. Again, I hope there aren't any freedom concerns, though they do have some nice addons that are firefox esr compatible with the addons at least having freedom respecting licenses.