prefs: [mathml.scriptsizemultiplier_attribute.disabled: true, mathml.scriptminsize_attribute.disabled: true, mathml.deprecated_style_attributes.disabled: true, mathml.deprecated_menclose_notation_radical.disabled: true, mathml.mathsize_names.disabled:true, mathml.mathspace_names.disabled: true, mathml.mfrac_linethickness_names.disabled:true, mathml.deprecated_alignment_attributes.disabled: true, mathml.script_shift_attributes.disabled: true, mathml.mfrac_bevelled_attribute.disabled: true, mathml.mfenced_element.disabled: true, layout.css.math-style.enabled: true]