No idea why isnt enabled by default in Firefox, because it is a very pretty gadget, and also makes switching between tabs more simple.
This tutorial on how to enable list all tabs, was tested and works in Firefox 3.6 and Firefox 4.
Updated: How to remove or hide list all tabs button in Firefox 3.6 and Firefox 4.

list-all-tabs-shortcut-preview-in-firefox

Contents:



Screencast on how to enable tabs preview in Firefox 3.6 and Firefox 4




Instructions on how to enable list all tabs shortcut and preview

  • Open Firefox 3.6 or Firefox 4
  • In address bar type: about:config
  • To enable the list all tabs icon in right corner of Firefox, find browser.allTabs.previews and change its value to true
  • To enable the tab preview when using Ctrl + Tab find browser.ctrlTab.previews and change its value to true

Notice: Ctrl + Tab shortkey preview works when there are opened more than 3 tabs, otherwise u can still use Ctrl + Shift + Tab



Remove or hide list all tabs button in Firefox 3.6

  • Open Firefox 3.6
  • Navigate to the menu Help > Troubleshooting Information, under the Profile Directory:, click Open Containing Folder
  • Open a folder named chrome
  • Open a file named userChrome.css
  • To the end of the file contents, add the following line:
  • .tabs-container > stack { display: none !important; }

  • Save the file, restart the Firefox 3.6, now the list all tabs button in the right upper corner is gone.
  • Now you can still open the List all tabs button by pressing Ctrl + Shift + Tab or you can navigate thru tabs with Ctrl + Tab

Remove or hide list all tabs button in Firefox 4

  • Open Firefox 4
  • Navigate to the menu Help > Troubleshooting Information, under the Profile Directory:, click Open Containing Folder
  • Open a folder named chrome, or create it if there is no folder named chrome
  • Open a file named userChrome.css, or create it if doesn’t exists.
  • If the file already existed, add the following line to the end of the file:
  • .tabs-alltabs-box-animate, .tabs-alltabs-button {display:none !important;}

  • If you created the file userChrome.css, add those lines into the file:
  • @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
    .tabs-alltabs-box-animate, .tabs-alltabs-button {display:none !important;}

  • Save the file, restart the Firefox 4, now the list all tabs button in the right upper corner is gone.
  • You can still open the List all tabs button by pressing Ctrl + Shift + Tab or you can navigate thru tabs with Ctrl + Tab

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