Password-protected CBZ / CBR files can be opened (#95). The password dialog has a Show password checkbox.
Tips on the home page
The home page shows a random tip with clickable links and keyboard shortcuts. Click the tip to see another one. Turn tips off with the ShowTips setting or Toggle Tips (CmdToggleTips) (#5515).
Manga mode and outline for all formats
Toggle Manga Mode works for PDF and other document types, not only comic books (#5498). Show Document Outline (previously Show PDF Outline) works for every format that has a table of contents.