Adobe services and products cannot be used in Cuba, Iran, North Korea, Syria, Crimea, or the so-called Donetsk and Luhansk People’s Republics. Firefly is also not available in Russia, Belarus, and China.
Firefly is currently a web app and can only be accessed at https://firefly.adobe.com. There is no standalone app to download.
Firefly supports Chrome, Safari, and Edge browsers on the desktop and is not currently supported on tablets or mobile devices.
Do a hard refresh on your browser, Ctrl(Cmd) + Shift + R. If this doesn't work, try accessing the site with an incognito browser.