Zen Browser's Firefox-Inherited Shortcuts

Opening a new tab (Ctrl+T / Cmd+T) and closing the active one (Ctrl+W / Cmd+W) work identically to stock Firefox, landing the new tab within whichever Workspace currently has focus rather than in some separate global tab list — the Workspace concept sits conceptually above ordinary tab management rather than replacing it, so these fundamental tab actions still apply within a Workspace's own tab set exactly as they always have in Firefox. A closed tab you didn't mean to lose comes back with Ctrl+Shift+T / Cmd+Shift+T, undoing the close entirely — position in the page, history, everything intact — and each additional press steps one tab further back through that history, exactly like Firefox has behaved for years, since this pulls from the same session-storage mechanism underneath. Spinning up a Private Window (Ctrl+Shift+P / Cmd+Shift+P) borrows Firefox's own private-browsing key rather than Chrome's Ctrl+Shift+N — a small but real trap if you regularly bounce between Zen and a Chromium-based browser, since the identical keystroke does something else entirely (or nothing) depending on which one currently has focus. Developer Tools (F12 or Ctrl+Shift+I on Windows/Linux, Cmd+Option+I on Mac) hand you Firefox's own DevTools without any Zen-specific substitution — its CSS Grid and Flexbox overlays, its Network and Console panels, all present exactly as a Firefox web developer would expect, since Zen has no separate developer-tooling layer of its own to swap in. Reader View (F9) toggles Firefox's native distraction-free reading layout for compatible article pages, stripping away surrounding page chrome and ads to show just the article text in a clean, adjustable typographic layout — inherited directly rather than rebuilt, since Zen's positioning around a calmer browsing experience aligns naturally with a feature Firefox already had. What's worth understanding about this inheritance more broadly: Zen doesn't maintain a forked or modified version of Firefox's core browsing engine — it tracks and rebases on top of upstream Firefox releases, meaning security patches, rendering engine updates, and most of the deep browser internals stay current with Mozilla's own release cadence regardless of how actively Zen's own smaller team is shipping its distinctive interface features on any given week. The inherited shortcuts covered here are consequently about as stable and unlikely to change unexpectedly as they would be in stock Firefox itself, in sharp contrast to the Workspaces and split-view bindings covered elsewhere on this site, which have genuinely shifted across Zen's own more actively iterating releases. One practical implication of this shared foundation: Firefox extensions install and run normally in Zen without modification, since the extension API surface Zen exposes is the same one Firefox itself provides — a Firefox add-on built for keyboard-shortcut customization, for instance, works identically in Zen for remapping any of these inherited shortcuts, the same way it would in stock Firefox, since nothing about how Zen implements these particular bindings differs from the browser it's built on. A few further Firefox conventions carry over even though none of them are single dedicated keystrokes covered in the shortcut table above. Ctrl+L (Cmd+L on Mac) drops the cursor into the address bar with whatever's currently there already highlighted, so typing immediately replaces it — a small convenience Zen never touches, since it has no reason to reinvent address-bar behavior that already works. Ctrl+Shift+Tab and Ctrl+Tab step backward and forward through tabs, but scoped specifically to whichever Workspace currently has focus — tab cycling never reaches across into a different Workspace's tab set, since each Workspace's tabs stay contained to themselves. Bookmarking (Ctrl+D / Cmd+D) opens the same bookmark editor Firefox has always had, tags and folders both included — Zen hasn't rebuilt or simplified this panel in any way, which means anyone relying on Firefox's tag-based bookmark search (rather than just browsing folders) keeps that exact same workflow available in Zen without any adjustment. Worth being explicit about scope here: this inherited category deliberately covers only the shortcuts that function identically to stock Firefox. Every shortcut that behaves even slightly differently in Zen, or that doesn't exist in Firefox at all, belongs instead in the workspaces or split-view-tabs categories covered elsewhere on this site — this page is specifically the "nothing new to learn here if you already know Firefox" reference, kept deliberately separate from Zen's genuinely distinctive additions so the two don't blur together.