Task 14: keyboard.js with focus cursor, multi-select, and action keys (j/k navigate, x/Space select, # delete, e archive, Shift+i/u read/unread, v move). New keyboardMultiSelect setting and CSS.
13 tasks covering manifest, settings, selectors, themes, observer, behavior patches, injector, popup UI, and test page.
Chrome extension to reskin Outlook OWA with minimalist themes, granular toggle controls, and MutationObserver-based clutter removal.
