Sideload extensions in Fennec?

Apps
1

Is it possible to load an add-on in Fennec that is not in the Mozilla store?

Mozilla removed the Bypass Paywalls Clean from the store, and while I can still install it on the desktop, I see no way to install it in Fennec.

Thank you.

2

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3

Will it be possible to add this functionality (like SmartCookieWeb-Preview does)?