Revert "Try and get more detailed Firefox logs from startx"

This reverts commit f424e5bac5. It
never actually worked, and the Firefox-dying bug seems to have
magically gone away recently.

lib/cockpit.pm

@@ -23,7 +23,6 @@ sub start_cockpit {
     # https://bugzilla.redhat.com/show_bug.cgi?id=1439429
     assert_script_run "sed -i -e 's,enable_xauth=1,enable_xauth=0,g' /usr/bin/startx";
     disable_firefox_studies;
-    assert_script_run "export MOZ_LOG_FILE=/tmp/firefox.log";
     # run firefox directly in X as root. never do this, kids!
     type_string "startx /usr/bin/firefox -width 1024 -height 768 http://localhost:9090\n";
     assert_screen "cockpit_login", 60;

lib/freeipa.pm

@@ -42,7 +42,6 @@ sub start_webui {
     # https://bugzilla.redhat.com/show_bug.cgi?id=1439429
     assert_script_run "sed -i -e 's,enable_xauth=1,enable_xauth=0,g' /usr/bin/startx";
     disable_firefox_studies;
-    assert_script_run "export MOZ_LOG_FILE=/tmp/firefox.log";
     type_string "startx /usr/bin/firefox -width 1024 -height 768 https://ipa001.test.openqa.fedoraproject.org\n";
     assert_screen ["freeipa_webui_login", $user_screen], 60;
     wait_still_screen(stilltime => 5, similarity_level => 45);

lib/installedtest.pm

@@ -120,11 +120,6 @@ sub post_fail_hook {
         upload_logs "/var/lib/pgsql/initdb_postgresql.log";
     }
 
-    # update Firefox default log (for startx firefox tests)
-    unless (script_run 'test -f /tmp/firefox.log') {
-        upload_logs "/tmp/firefox.log";
-    }
-
     # Upload /var/log
     # lastlog can mess up tar sometimes and it's not much use
     unless (script_run "tar czvf /tmp/var_log.tar.gz --exclude='lastlog' /var/log") {