'Upstream' the idea to ship OS images with Firefox/Iceweasel has been dropped in the meantime due to horribly low performance in favour of chromium-browser. As far as I understood that's partially related to firefox acting single threaded (while Chromium uses all CPU cores).   Here's longsleep's latest config and the mostly accepted 'fix' for Chromium complaining about running insecure due to missing sandboxing is disabling exactly this. (that's Hardkernel's method to 'fix' Chromium on