how to use addons on firefox mobile

[regn]

seems a stupid question, but i added to my android firefox (52) 2 addons:
manage multiple accounts
and
multiple accounts to any website.
but i cannot find out how to use.
these add-ons are announced to run from version 48.

In the desktop version there should be new buttons - but here not.
Also, there are no additional entries in the menue, as i saw in version 68

i cannot not user newer versions because the tab has a Tegra2 CPU (asus eepad ) on which newer versions do crash.
kind regards

[oliverzofia]

If you want to find Firefox add-ons and install it mobile then follow the steps below:

Step 1: Open Firefox web browser and click the "menu" button.
Step 2: Click on the "Tools" menu item (you may need to tap "More" first).
Step 3: Click the "Add-ons" menu item.
Step 4: Click "Browse all Firefox Add-ons".
Step 5: Choose the add-on that you want to install, then click on the "Add to Firefox".
Step 6: Adhere to the installation prompts. It may need to be restarted in some add-ons. Now enjoy your add-ons.