Just a heads up for anyone running firefox on Scientific Linux 6 (and RHEL6 plus other clones, or other GTK2-based platforms). Red Hat Enterprise Linux 6 uses gtk2 in firefox 52.8esr, but I see from https://bugzilla.mozilla.org/show_bug.cgi?id=1278282 that Firefox 59 dropped the option to build with gtk2. In https://access.redhat.com/announcements/3365141 Red Hat talk about plugins and addons with FF60 in RHEL6, which suggests that they either aren't aware of the gtk2 issue or have it under control. Two very different possibilities. I guess it is time to migrate my main desktop off SL6 :-( -- Andrew C. Aitchison Cambridge, UK [log in to unmask]