am I the only one for which seamonkey segfaults without any other message?

I'm running slackware64-current. I just launched seamonkey, it ran as expected.

Seamonkey running OK here on current as well.

It works here, but I have certainly seen that behavior in the past. There are two bits in the SlackBuild to help prevent that problem - using -O1 as the optimization (more aggressive optimization seems to increase the odds of a crash), and -fno-delete-null-pointer-checks.

In case you were using a version of Seamonkey that was compiled with gcc-8.1.1, I recompiled it here. The resulting packages were still stable for me.

BTW, the site I use to test Seamonkey stability is onet.pl which was recommended to me by one of the people reporting Seamonkey crash issues. If that site won't crash it within 30 seconds, nothing will.

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It's the official version, not the one I compiled in SFS.

Seamonkey 2.49.3 (Slackware 14.2 latest update) does crash for me, occasionally. There might be a message but you have to look in your session log file or someplace like that. For me, the crash message always contains "ABORT: X_GLXDestroyContext: GLXBadContext". The crashes are not very frequent, and not repeatable, except for one particular web site I use, a mapping site hosted at arcgis.com, that always crashes Seamonkey when it first loads. (I use Firefox for that site...)

I tested this:
- fresh install of slackware64 on a new partition: crash
- rebuild seamonkey with gcc-8.1.1 on my slackware64-current system: crash
- test on slackware-current (x86): crash

Can you rebuild SeaMonkey in debug mode then run it with GDB (GNU Debugger)? Simply by running it in the debugger it should tell you more information why it crashes.

Here's a quick GDB tutorial in case you need it:
http://unknownroad.com/rtfm/gdbtut/gdbtoc.html

rebuilt on Slackware From Scratch it works, but not on my current systems.

There is now a Slackware-14.2 update (patch) with Seamonkey 2.49.4.

This new Seamonkey is built with Gtk+3, where as previous Slackware versions were built with Gtk+2. It doesn't look very different to me, which is good. Other applications that moved from Gtk+2 to Gtk+3 got some weird features like auto-hiding scrollbars, which I don't like.

There was one website that Seamonkey-2.49.3 would always crash on for me, and the new 2.49.4 does NOT crash. That's very good news, although I just updated and haven't tested it that much.

Should've read that post before I wasted bandwidth on useless package. Anyway, thanks for letting us know.

Finally I got it working by removing under ./mozilla directory the sub-directory seamonkey.