I think all that is needed is to allow the program launched by the browser launch script (firefox/iceweasel/chromium-browser) some time to load the generated files before they are removed.
Untested patch:
--- src/man.c.orig 2010-10-17 17:18:39.316771588 +0100
+++ src/man.c 2010-10-17 17:21:03.760738174 +0100
@@ -2226,6 +2226,7 @@
old_cwd);
chdir ("/");
}
+ sleep (10);
if (remove_directory (htmldir) == -1)
error (0, errno, _("can't remove directory %s"),
htmldir);
--
Sam Morris <https://robots.org.uk/>
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