By the way, the Firefox Settings has five true settings panes - General, Home, Search, Privacy & Security, Sync - plus the allied More from Mozilla Pane.
I get to the "Pane List" by hitting SHIFT + TAB 3 times immediately after opening Settings, at which point you will be on the General Pane entry and can down arrow until you hit Privacy & Security Pane. For any pane, hitting TAB 4 times from the Pane List gets you to the first setting in that pane.
There may be an easier way, but my "quick and dirty" testing didn't uncover it.
Brian - Windows 10, 64-Bit, Version 21H2, Build 19044
You can't crush ideas by suppressing them. You can only crush them by ignoring them.