Have now found that this is the Stylish plugin. Disabling it has made checkboxes appear again, although possibly unstyled. Feedback sent to Stylish devs.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1698407 Title: Checkboxes not showing on some sites To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1698407/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs