How to Enable a Firefox Extension in Pri…
https://www.howtogeek.com/702133/how-to-enable-a-firefox-extension-in-private-browsing-mode/
Follow the steps here below on how you can the extension enabled in your Firefox Private mode: Click the “Firefox” menu button (three horizontal lines) and select “Add-ons” from the menu. In the “Add-ons Manager” tab, locate the extension you’d like to use in Private mode and click the ellipses button (three dots) beside it. Select “Manage Extension” from the drop-down menu. In the “Manage Your Extension” tab, scroll down to the “Run in Private Windows” section. Select “Allow” from the drop-down menu to enable the extension in Private mode. Open your Firefox web browser Select from the hamburger icon, and select Add-ons
Click the “Firefox” menu button (three horizontal lines) and select “Add-ons” from the menu.
In the “Add-ons Manager” tab, locate the extension you’d like to use in Private mode and click the ellipses button (three dots) beside it.
Select “Manage Extension” from the drop-down menu.
In the “Manage Your Extension” tab, scroll down to the “Run in Private Windows” section.
Select “Allow” from the drop-down menu to enable the extension in Private mode.
Open your Firefox web browser
Select from the hamburger icon, and select Add-ons
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