Your device is an Android device? You can install Firefox from Google Play:

Install Firefox on an Android device using Google Play

If you got a message about creating a Firefox Account, you do not need a Firefox Account to use Firefox on a single device whether on desktop (Windows, Mac OSX, Linux) or mobile versions on iOS and Android.

Sync is optional.
You can close the tab once you have created the Sync account if you do not want or can't add a mobile device.

Hi - I’m stuck halfway installing Firefox as iPad ran out of juice. Now i cant find the page to create my password and it wont let me delete and begin downloading from the beginning. What do i do?

Hi - I’m stuck halfway installing Firefox as iPad ran out of juice. Now i cant find the page to create my password and it wont let me delete and begin downloading from the beginning. What do i do?

The problem is with installing Firefox on your iPad?

When you logged in here, you used your Firefox Account, so you can use that password to log your Firefox for iOS into your Firefox Account as well.

Hi savitri1

Did this power cut happened while you were installing Firefox or is Firefox installed properly and running properly ?