For the iPad you should install. http://itunes.apple.com/us/app/firefox-home/id380366933?mt=8

For desktop OS X you should download Firefox from http://download.mozilla.org/?product=firefox-5.0&os=osx&lang=en-US

Yeah, please follow kbrosnan's instructions and then visit this article: How do I set up Sync on my computer?

I own an Android. I also have Windows 7 on my computer. I have been trying everything to sync the two. Unfortunately I can't because my computer cannot open the xpi extension.

I already use Firefox on both my phone and my computer as my chose browser. I truly love it, but I'm getting frustrated with the sync feature.

Every time I look for the app to open the xpi extension there's a request to download a virus scan app. I actually don't need a virus scan. If I do download another virus application my regular virus protection which I have paid for will not work with the interference. I believe none of the virus protection apps work with interference from other products.

Please tell me how to download the app for the xpi extension so that I can sync my computer and my android.