Skype continues to introduce more new features and enhancements with every update they release. Recently, Skype for Windows Phone — includes both Windows Phone 8/8.1 — was bumped to version 2.2, ...
Firefox reportedly only ended support for 2001 OS Windows XP (and Windows Vista) in 2023, which means a pretty impressive 19 years of support (accounting for Firefox 1.0 releasing in 2004).
Mozilla had planned to end support for Firefox on Windows 7, 8, and 8.1 in 2024. Extended support now ends in February.