Hi

Add-ons for the desktop and Android version of Firefox are unavailable for Firefox for iOS.

Apple has created a proprietary iOS extension system which is incompatible with Firefox add-ons and extensions for Android, Mac, Windows and Linux. Also, iOS extensions written for other iOS apps won't work on Firefox for iOS (for example extensions written for Safari won't automatically work on Firefox for iOS).

These Extensions at https://addons.mozilla.org/firefox/ are for desktop Firefox on Windows, macOS, Linux.

These Extensions https://addons.mozilla.org/android/ are for Android Firefox.

https://support.mozilla.org/en-US/kb/add-ons-firefox-ios