Use Private Browsing. To use Private Browsing, simply open a Private Tab by following these steps: Tap the tab icon at the bottom of the screen. Tap the mask button at the top of the screen to switch to Private Browsing. The mask will turn purple when you've entered Private Browsing. Tap the new tab button to open a Private Tab.

May 22, 2020 How To Disable Private Browsing in Firefox Mar 13, 2019 How To Allow Add Ons In Private Browsing Firefox In previous Firefox versions, any extensions you installed would run in private and non-private browsing windows by default. This could be Extensions in Firefox 67 | Mozilla Add-ons Blog

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