Firefox 3.5 to feature new window restore feature

Firefox 3.5 restor windows

The latest nightlies of upcoming Firefox 3.5 Beta 4 now feature a new option in the History menu to restore recently closed windows and not only individual tabs as in previous versions.

The new functionality should become a welcomed time saver those times we mistakenly close a handful of tabs, provided it is one of the last three windows closed, the current limit. You can change the number of “restorable windows” by updating browser.sessionstore.max_windows_undo to your preferred value via about:config.

Asked why wasn’t this feature implemented in a single menu option where a user can choose a window or a specific window tab, Mozilla Corporation’s Paul O’Shannesy, explains: “My primary reason is that windows and tabs serve a different purpose. By putting them in the same menu and giving them the same keyboard shortcut, I would argue you’re actually increasing memory load and forcing the use of the menu. If I were to close a window, then close a tab in a different window, I can’t get the window I closed back with a single key command. I have to click the menu, and look. By keeping the two separate, there might be one extra place to look, but they are clearly labeled. There’s an extra keystroke to learn, but it correlates to open window in the same way that undo close tab correlates with new tab.”

Firefox  3.5 Beta  is expected within the next couple of weeks and should be the last beta (despite nightly Shiretoko labeled as preBeta5) before entering release candidates and final version soon after.


  1. Ralph April 27, 2009 11:36 am 


  2. Mike Beltzner April 27, 2009 7:46 pm 

    Paul’s no longer an intern, BTW. He’s a full-fledged Mozilla em-ploy-ee!

    • Percy Cabello April 30, 2009 10:07 pm 

      Thanks for the clarification, Mike.

  3. Firefox 3.5 beta 4 disponible - Zona Firefox April 28, 2009 3:29 pm 

    [...] estaban abiertas al momento de cerrarla. Como pequeño truco, a través de about:config se puede configurar el número de ventanas a recuperar, modificando el valor de la clave [...]

  4. Adam August 20, 2009 4:11 pm 

    This saved me so much frustration, I accidentally closed my main Firefox window with 30+ tabs open, but was able to reopen the window with all tabs still intact.
    Thx for giving me the heads up!

  5. Shawn Jones September 14, 2009 10:18 pm 

    I still wish there was a way to restore session tabs one at a time – after having closed a browser – so as not to overwhelm the browser once it’s restarted.

    • Paul Wendling October 8, 2009 12:38 pm 

      I, too, wish there were a way to restore tabs one at a time.

      I just got bit by some web site. Editing the session.rdf file doesn’t seem to be as easy as removing … blocks.

      • Paul Wendling October 8, 2009 12:38 pm 

        That was supposed to be RDF:Description blocks

  6. Shawn October 9, 2009 4:18 am 

    I downloaded the FireFox Add-on Session Manager, and use it instead of TabMix Plus for restoring; It works great!! You can even choose which tabs to restore. I changed the number of sessions to save to 10. Very happy with it so far.

  7. Joan November 27, 2009 7:01 am 

    Cinemark Peru :D btw good post! (=

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