@alex_malyu said:

http://doc.qt.io/qt-5/activeqt-index.html

I'll give it a try. I've got a client wanting plugins for FF, Chrome, Safari, and IE. All are somewhat easy (manifest text file + some XML, HTML, Javascript, jQuery) except for IE. On IE, one STILL (yep, disappointing that Microsoft doesn't run with the pack yet) requires that you compile it into a COM object DLL and then through some registry stuff, hook it into IE. (BTW, the new experimental Edge browser from Microsoft has no extension support yet. Windows 10 comes with both Edge and IE11.)