This is a Firefox support forum, not a mac one, so we won't be able to help with the specifics of updating your mac, but Apple has a good support page set-up at http://www.apple.com/osx/how-to-upgrade/ to help you get from 10.7 to 10.11.
As for iOS (and you should be running the most recent version of iOS for security reasons) both Firefox and safari are equally secure, as they both use the same backend (Apple won't allow a competing backend on ios), but if you are using Firefox on your computer, using Firefox on your iOS device will allow you to sync your bookmarks and other data between devices (Sync your Firefox bookmarks, open tabs and browsing history in iOS)
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Mac Os X Versions
Jul 12, 2001 Download Old Version of AIM for Mac for Mac OS X 10.7 (Lion) (Intel) Skip Development Versions tead. Version Name. Released Date.
Jul 14, 2017 I am not able to update from Mac OS X Lion 10.7.5 (11G63) version to newest version. I need this update as several softwares are not working on this version. Latest Skype version). When I checked my system 'about this Mac' it says. Software Mac OS X Lion 10.7.5 (11G63).
Upgrade Mac Os X 10.7.5
Aug 08, 2011 Read reviews, compare customer ratings, see screenshots, and learn more about Course For Mac OS X (10.7) 101 - Core Lion. Download Course For Mac OS X (10.7) 101 - Core Lion for macOS 10.9 or later and enjoy it on your Mac.