I too had it working on Ubuntu 14.04, (with Pipelight, Wine and Silverlight) which was great though a bit slow.
However yesterday I used the general software update. Foolishly I had not imaged the disk first. A new version of Firefox was installed and now SkydemonLight does not work in Firefox because they have disabled Silverlight. Their explanation on the support pages was almost identical to Microsoft's rationale for not supporting Silverlight in Edge.
The only browser I have on Ubuntu that still can access SkydemonLight is Midori (also using Pipelight, wine and Silverlight).
Tim Dawson, if you read this, is there any plan to provide an interface to SkydemonLight which does not require a plugin? Thanks.