How to install nos2x extension on Firefox for Android.

Open Firefox.

Go to https://github.com/diegogurpegui/nos2x-fox/releases/tag/v1.17.0 and download the .xpi file to your mobile

Open a new tab, remove the keyboard to be able to see the 3 dots button on the top right.

Click the 3 dots button and then click Settings (should be the last option)

Scroll down and click About Firefox.

Click 5 times in the Firefox logo to enable Developer's options.

Go back, you now should be able to see new options on Settings. Click “Install extension from file”.

The file you downloaded in the first step should be visible in the list of files. Click it to install the extension.

Configure the extension by creating a profile and adding a secret key.

You are good to go.