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Make Firefox 47 load all tabs at startup and disable tab loading on demand

Prior to version 47, Firefox had the ability to disable the default lazy tab loading behavior. The user had a choice to load only the active tab when Firefox opens or load all tabs at once in the background. With Firefox 47, this option was removed from the browser's Preferences. If you need to load all your tabs when Firefox 47 starts, here is how it can be done.
firefox logo banner By default, when you start Firefox 47 and restore your previous session, the browser will load a particular tab only after you switch to it. This allows Firefox to start quickly.

In earlier versions of Firefox, it was possible to simultaneously load multiple tabs in the background. The browser had an option "Don't load tabs until selected" in its Preferences.

When you upgrade to Firefox 47 and above, and you had this option unchecked, then this setting is reset.

To disable this behavior and make Firefox 47 load all tabs at startup, do the following.

  1. Open a new tab in Firefox and enter the following text in the address bar:

    Confirm that you will be careful if a warning message appears for you. Firefox 50 accept about config

  2. Enter the following text in the filter box:
    browser.sessionstore.restore_on_demand browser.sessionstore.restore_on_demand
  3. The option browser.sessionstore.restore_on_demand will appear in the list. Set it to false Firefox 47 disable tab load on demand Firefox 47 disable lazy tab loading

This will disable the tab loading on demand in Firefox 47, meaning all tabs will begin loading at once. It can be useful for users who open a relatively small number of tabs and want to access them instantly.

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