Firefox 20 arrives with per-window private browsing, new download manager, separate plugin closing, and more
Mozilla on Tuesday officially launched Firefox 20 for Windows, Mac, Linux, and Android. The improvements include per-window private browsing, a new download manager in the Firefox toolbar …
Context & Ripple Effects
Mozilla shipped Firefox 20 to Windows, Mac, Linux, and Android in a single coordinated release, folding three user-facing changes into one version bump: per-window private browsing, a download manager integrated into the Firefox toolbar, and the ability to close plugins independently of the browser.
The launch drew same-day pickup from at least eight outlets — The Mozilla Blog, Engadget, CNET, TechCrunch, gHacks, and Softpedia among them — and the coverage consistently led with the privacy change, signaling that per-window private browsing is the feature carrying this release rather than the download-manager refresh.
First-order effects
- Firefox users on all four platforms can now run private windows alongside ordinary ones instead of suspending the entire session, ending the all-or-nothing choice between private mode and normal browsing.
- Users gain the ability to close an individual misbehaving plugin without killing the whole browser, and download progress moves into the toolbar where it is visible during any browsing session.
Second-order effects
- Rival browser makers face pressure to match per-window privacy granularity, because Mozilla's rollout reframes private browsing as a per-tab decision rather than a special mode users must remember to enter and exit.
- Making plugins individually closable shifts responsibility for plugin stability onto plugin vendors themselves, since a hung plugin is now a disposable component rather than a browser-wide failure.
Third-order effects
- If per-window privacy becomes table stakes across browsers, private browsing evolves from an occasional escape hatch into a routine way of partitioning daily activity — raising baseline expectations for what default browser privacy looks like.
- Granular plugin control points toward browsers progressively isolating third-party plugins into components users can dismiss one by one, eroding the old model where a single plugin could take down the whole application.
The trend: Browser makers are competing on granular, always-available privacy controls rather than bolt-on private modes, with Mozilla's per-window model in Firefox 20 as one data point.