Trying to add Proton Pass extensionto iPad version of firefox

I have proton pass on an extension on Firefox on my iMac. I want to add the extension to my Firefox on iPad. I deleted Firefox app and reinstalled, I thought I downloaded the extension of proton pass, but I can’t find it. Each time I go back to Firefox and search for the extension it asks me to download Firefox again. I’m in a loop. Would appreciate any help! Thanks!