Mozilla doesn't make a version of Firefox for iPhone, iPad, or iPod. Mozilla only has the FirefoxHome app for iOS, which is used to synchronize specific data from Firefox on another device. The FirefoxHome app doesn't need Flash.

Further information at:

https://wiki.mozilla.org/Mobile/Platforms

iPhone/iPad/iPod
   We have no plans to release the full Firefox browser for iOS. The iOS SDK agreement requires apps to use Apple's own JavaScript engine (or none at all, like Opera Mini which downloads pre-rendered pages from Opera's servers and cannot run JavaScript code in the client). Because of this, we have no supported way to distribute Firefox's rendering and JavaScript engine to iPhone users. 
   However, you can download Firefox Home for iPhone, an iOS app that uses Firefox Sync to deliver Firefox bookmarks, browsing history, and tabs to your iPhone or iPod Touch.