about:preferences hash urls do not work properly in Tor Browser
Firefox allows you to access various sub-sections of the various pages in about:preferences by accessing urls in the form about:preferences#$(pane)-$(section). Ie, to access the Privacy -> Reports section you can navigate to: about:preferences#privacy-reports
In latest version of vanilla Firefox this navigates to the Privacy pane and then scrolls down to the Reports section. In Tor Browser, it only navigates to the Privacy pane, without scrolling down the the Reports section.
This feature is required for the 'Advanced Security Settings...' button to work correctly in the new security UI.
The relevant place to start looking is in the init_all() and gotoPref() methods in /browser/components/preferences/in-content/preferences.js
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information