have donloaded Fireshot xpi from developer website. how do i install it

The Redmi Tab 2 is a Android tablet. The Fireshot extension is only for desktop Firefox? https://addons.mozilla.org/firefox/addon/fireshot/ as there is no listing for extension on https://addons.mozilla.org/android/ Support for this third-party extension is at https://getfireshot.com/sup/ and https://getfireshot.com/using.php