Hard to say, it depends on Skype's technical requirements. Does it require a plugin? As you probably have read by now, the <em>regular release</em> of Firefox 52 only allows one plugin, which is Flash. The <em>Extended Support Release</em> (ESR) of Firefox 52 will still run Java, Google Talk, and other old plugins. It gets security updates but no feature changes for about a year at a time. ESR was first developed to meet the needs of large organizations that wanted Firefox to change much more slowly, but anyone can use it. <p>More information on this change and ESR: [[Why do Java, Silverlight, Adobe Acrobat and other plugins no longer work?]]</p> <p><em>Windows Users:</em> When you get to [https://www.mozilla.org/firefox/organizations/all/ the ESR installer list], you'll notice at least two different downloads for Windows:</p> <ul> <li><strong>Windows</strong> installer is the <strong>standard version for Windows</strong> that runs on both 32-bit and 64-bit Windows Vista through 10 (and 32-bit XP), the best choice for most users</li> <li><strong>Windows 64-bit</strong> installer ONLY runs the Flash and Silverlight plugins, so that is not what you're looking for. (If someone reading this only needs Silverlight and is considering switching to 64-bit, there may be some extra file cleanup to do on your system. See: [[How to switch from 32-bit to 64-bit Firefox]])</li> </ul> <p>Does that restore Skybe functionality?</p>