Go to the Settings page, scroll down to the bottom.
Tap on "About Firefox".
Tap on the Firefox logo 5 times. It will display a message that says "Debug Menu enabled".
If you go back to the Settings page, you'll notice that a new option is available under the Advanced section.
It's called Custom Add-on Collections.
Tap on it, and it will ask you to enter the collection owner's ID, and the collection's name.
The ID is a unique 6-digit number that can be found in your add-on collection's URL.
The name of course refers to the collection's name, unlike the number this is something that you can choose.
For example, https://addons.mozilla.org/en-US/firefox/collections/***926754***/***ghacks***/
The ID for this collection is 926754 and the name is ghacks.
Otherwise I'm pretty sure you can use terminal emulator like Termux on Android. You should be able to install python and use all those commands just fine...