My Mom wants to be able to use Firefox Sync to sync her bookmarks between her laptop and her iPad. What browsers support Firefox Sync?
How about Firefox Home (if it is available in your country)? It's not a browser but you can sync your bookmark, and open them via Safari.
Now Mercury Browser not support Firefox Sync. Foxbrowser is a good alternative. [ https://itunes.apple.com/us/app/foxbrowser/id550365886?mt=8 ]
Firefox is now available for iPad.