WhiteBox Learning is in the process of updating all of our applications to use WebGL, a built-in technology of modern web browsers that will allow students to use WhiteBox applications without installing any plugins - including the Unity Web Player.
As WebGL is a newer technology, it is not quite as efficient with computer resources as the plugin. However, in our early testing this only seems to be a problem with much older machines with limited resources, specifically RAM. Although not a hard requirement, if your computers have at least 2GB of RAM it should be fine. Another requirement is an up-to-date version of video card drivers. The big three vendors are Nvidia, AMD/ATI, and Intel. A generic video driver such as one for a Virtual Machine (VirtualBox, VMWare, etc.) may not be supported by the browser and/or the Unity platform.
As an aside, our early testing has also worked on Chromebooks, even some older models.
At the present time, Firefox is by far the best with regards to WebGL performance. Chrome also works fine, but you may have more success with older machines using Firefox instead. Although Internet Explorer 11 officially supports WebGL, it does not appear to be powerful enough for Unity apps. For this reason we plan to continue to provide a plugin version and WebGL version to support customers who must use Internet Explorer, or those who have older machines that would benefit from using the plugin. We encourage customers to use WebGL as they are able and we will eventually transition away from the plugin altogether.
As part of our upgrades, a final requirement is that Internet Explorer users must use version 10 or higher, even if using the plugin. If you are using Windows 7/8/8.1, you can upgrade to Internet Explorer 11 and are likely already using this version. If you are using Windows Vista or XP, you will need to use Firefox or Chrome since you cannot upgrade to IE 10/11 in these versions of Windows.
Our goal is to have WebGL working for all of our applications by the start of the school year. An official release date for each application will be announced in the coming weeks on our support page.