Missing style prefix in admin_panel.css breaks website frontend styling
We just happen to include the same FontAwesome icon styles that the AdmPanel is using.
Most style definitions in the admin_panel.css are prefixed with #TSFE_ADMIN_PANEL_FORM, except for one: ".fa:before".
On a second note... maybe renaming the AdmPanel font-family from 'FontAwesome' to something like 'Typo3FontAwesome' would be useful too. What would the implications of that be?