Settings dashboard built with extracted ExtUI component library (Dashboard, TabPanel, SortableList, Section, SettingRow, ImportExport, ShortcutsList). Six tabs: General, Columns, Display, Notifications & Theme, URL Blocklist (drag-and-drop reorderable rules with enable/disable), and My Extensions (AMO profile card with linked extension list). Theme auto-detects system colour scheme via prefers-color-scheme.

• Extracted ExtUI library (ext-ui-lib/) — zero-dependency, drop-in UI toolkit with CSS custom-property theming, OLED dark aesthetic, and reusable components: Dashboard sidebar+router, Popup shell, SortableList, HistoryView, SettingRow, ImportExport, ShortcutsList.
• Popup / Sidebar dual-mode — auto-detects environment and adapts layout. Works as both a toolbar popup and a Firefox sidebar panel.
• Advanced filtering — filter by resource type, status code, HTTP method, response size (KB), and regex or plain-text URL search.
• Sorting — click any column header to sort ascending/descending.
• Domain grouping — collapsible sections that group requests by origin host.
• Request deduplication — folds identical requests into a single row with a count badge.
• Timing bars — coloured inline bar visualising relative request duration.
• CURL copy & HAR export — one-click copy as curl command or export full HAR 1.2 JSON.
• Keyboard shortcuts — / focus search, P pause/resume, C clear, Esc reset filters.
• Multi-tab selector — switch which tab's requests are viewed without switching tabs.
• Statistics bar — live count, total size, average latency, error count, and filtered count.
• URL Blocklist — regex or substring patterns that cancel matching requests in real time. Managed from the dashboard with drag-to-reorder priority.
• 5xx notifications — browser notifications on server errors, throttled to 3 s.
• Persistent log — optional storage-backed request log surviving restarts and popup closes.
• Pause when closed — stop intercepting when no panel is open.
• Sidebar support — sidebar_action in manifest for native Firefox sidebar integration.
• AMO-compliant icons — full SVG icon system built with DOM APIs (no innerHTML).