Alt+1 Scrolls to Top and Toggles Main Menu at top (& Secondary Menu if any)
Alt+2 Scrolls to Bottom at Footer Links
Alt+Z Previous Page (of those listed in the Main Menu at top)
Alt+X Next Page (of those listed in the Main Menu at top)
Alt+M Go to Site Map page
Alt+N Access Help Guide (Question Mark Icon ) in the small window (has larger version link)
Alt+B Access Settings (Gear Icon )
Alt+R Toggle Religion Comments Filter ON / OFF (without accessing Settings)
Alt+C Toggle Black Text substitution for lavender ON / OFF (without accessing Settings)
Alt+G Toggle Gecko Animations ON / OFF ( available only on Innocence page )
Alt+Q eMail to Doug (opens default client & new mail)
These Alt Key combinations work in Edge, Internet Explorer, Google Chrome, Safari and later versions of Opera browsers.
In Firefox, use Alt+Shift+letter key
Hotkey combinations do not work consistently for all given above. The "Color to Black" switch, "Religion Comments" filter and Gecko Animations On/Off can be accessed from the Settings (gear icon).