There is no way to directly import bookmarks from Chrome for iOS to Firefox for iOS. One workaround is to import them on your desktop versions, and use Firefox sync so Firefox of iOS pickups up those imported bookmarks. To import bookmarks from Chrome on the desktop, use the instructions at [[Import bookmarks from Google Chrome]]. Then to sync Firefox for iOS with the desktop version, use the instructions at [[Sync your Firefox bookmarks and browsing history in iOS]]