The Skype web plugin works in the following browsers:
On Windows desktop: Internet Explorer 9 and higher, Firefox and Chrome.
On Mac OS: Safari, Firefox and Chrome.
If you use several internet browsers on your computer, you only need to install the Skype web plugin for one and it will be available for other supported browsers as well.
If your browser doesn’t support add-ons, or you can't install the web plugin for any reason, you can still send instant messages to your Skype contacts using Skype for Web. However, the Skype voice and video call options won’t be available.
The Skype web plugin is not supported on Windows RT, Linux and Chromebooks.