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The menu option to allow Firefox to load multiple tabs simultaneously has been removed in version 47 and over. Learn how to change this setting in about:config.

Your version of Firefox may be using the multiprocess feature already. Follow these instructions to make sure: #Type '''about:support''' in your address bar. #In ''Multiprocess Windows'', if the number is higher than zero (0), you already have the multiprocess feature activated. If the number is zero (0), follow these instructions to turn it on: #[[Template:aboutconfig]] #Search for {pref browser.tabs.remote.autostart} and double-click on the preference to set its value to {pref true}. #Restart Firefox to enable multiprocess. {warning}Allowing Firefox to load tabs simultaneously can slow down its startup.{/warning} {/for} {for not fx48} If you've allowed an earlier version of Firefox to simultaneously load multiple tabs in the background (offered as the "Don’t load tabs until selected" check box in the {for mac, linux}Preferences{/for}{for win}Options{/for} menu), when you upgrade to version 47 and up, your setting will reset to allow only one tab at a time. You can change it back through your ''about:config'' preferences (advanced users only): #[[Template:aboutconfig]] #Search for {pref browser.sessionstore.restore_on_demand}. #Double-click on the preference to set its value to {pref false}. #Close the ''about:config'' tab to save your changes. {warning}Allowing Firefox to load tabs simultaneously can slow down its startup.{/warning} {/for}