Mozilla developers have added support for add-ons to the codebase of the Firefox Preview mobile browser (Fenix), which is being developed to replace the Firefox edition for the Android platform. The new browser is based on the GeckoView engine and the Mozilla Android Components library set.
The ability to connect add-ons based on the WebExtension API is available for testing in the nightly builds of Firefox Preview. The item "Add-ons Manager" appeared in the menu, which shows the add-ons available for installation. In its current form, only uBlock Origin is present in the list of add-ons compatible with Firefox Preview. Support for other add-ons is expected later.
Get more at the official blog.