Reopen Closed Tabs in Firefox

Closed Tabs With an Open Window

1. Step 1

   Click on “History” from the Firefox browser window of the closed tab. This will open a list of options. Toward the bottom of the list is the option “Recently Closed Tabs."

2. Step 2

   Click on the side arrow with “Recently Closed Tabs.” This will open another list. This list contains the names of all recently closed tabs, plus an option to “Open All in Tabs.”

3. Step 3

   Select your desired tab by clicking on it. If you are not sure which recently closed tab it is, you can alternatively select “Open All in Tabs” in order to view them all. Select the correct tab, and close out of all unneeded tabs.

When the Window Closes

4. Step 1

   If closing your tab also closed your window, not all is lost. Open a new window and click on “History."

5. Step 2

   Between “Home” and the grayed-out “Recently Closed Tabs” is the history of the sites that have been recently visited. Your closed tab should appear in this list. If you have your settings adjusted to erase your history when you close out of Firefox, this option will not work.

6. Step 3

   To check or change your “History” settings, click on “Tools,” then “Options,” and then “Privacy." Make sure to check the option to “Remember visited pages for the last [insert any number here] days."

How to Minimize Firefox Memory Usage

1. Method 1 - -
   
   (1)Open Firefox and click Tools in the browser top menu, then click Options > Privacy.
   
   (2)In the 'History' section, leave 'Remember what I’ve downloaded' unchecked.
   
   (3)In the 'Private Data' section, click the button 'Clear now...', when the dialog box comes up, put a check mark beside these items: Cache, Saved From and Searched History, Offline Website Data. You can mark the 'Cookies', too, if you want. Click 'OK'.

2. Step 2

   - - Method 2 - -
   
   (1)In the Firefox address bar type [about:config], minus the brackets, and press Enter. Click the button "I’ll be careful, I promise!" if you are seeing a warning message.
   
   Next, create a Boolean (false) value and name it "config.trim_on_minimize", without quotations. Set it’s value to 'True'.
   
   You should set the value according to the mount of physical RAM installed on your computer. Set value according to the following: (Installed RAM: 256MB / Set the value to: 4096), (Installed RAM: 512MB / Set the value to: 8192), (Installed RAM: 1GB / Set the value to: 16384), (Installed RAM: 2GB /Set the value to: 32768), (Installed RAM: 4GB / Set the value to: 65536) (Installed RAM: 8GB / Set the value to: 131072).

3. Step 3

   - - Method 3 - -
   
   (1)Launch Firefox then enter this, [about:config], without the brackets, in the address bar.
   
   (2)Scroll down and find entry that says: browser.sessionhistory.max_total_viewers, double
   click the item.
   
   (3)In the 'Enter Integer Value' text box, type in:
   "0" to disable the Firefox cache, change "1" through "8" to set the maximum cache; to "1" through "8" previously viewed pages, enter "-1" to return the cache to default. Enter value without quotation marks.

4. Step 4

   After reclaiming some RAM from Firefox, open the Task Manager while keeping firefox browser open. To access Task Manager:
   
   (1)Click 'Start'. Control Panel > Administrative Tools > Performance
   (2)Find the Firefox process on the current activity list, and view the RAM usage. You'll witness Firefox RAM usage drop dramatically.

5. Step 5

   According to lab tests, Firefox never seems to clear the cache memory it uses. It won't let go of memory until you close all windows Firefox. If you never close Firefox browser completely while spending several hours on the web, your computer will use nearly 1GB of accumulated memory during the session. If you feel a lag on your Firefox browser speed while online, then it might be a good idea to try the fix suggestions in this article.