Has anyone ever embedded the firefox web browser technology in their own [unmanaged] C/C++ GUI application in the same way that IE can be embedded as a COM object? (I would like to do this on Linux, not Windows). Are there "better" alternatives to firefox? I'm open to anything as long as I can use it with non-GPL code. My needs are fairly basic; I only need fundamental HTML parsing and display of static local files, but I'd take advantage of more sophisticated technology, if I can get it. I'd like to be able to use JavaScript, but I can get by without it.
Check out webkitgtk. It's not Gecko, but Webkit based. It basically provides a web browser widget that can be used in GTK+ applications. If you want to embed mozilla, there are things in the mercurial repositories for Mozilla repository that let you do it, but it didn't seem heavily supported last I checked.
It is possible to use parts of Firefox (such as the Gecko renderer) in other apps. There are various approaches to this, including wxWebConnect, a web browser control for wxWidgets. See also Embedding Gecko
Another popular solution is WebKit. Again, there are various ways you can use this, including QtWebKit (a wrapper for the Qt toolkit) and webkitgtk (already mentioned by SB).
First you need to differentiate between HTML engine and JavaScript Engine.
Firefoxs HTML rendering engine is called Gecko. And here is a guide about Embedding Gecko in your application.
Firefoxs JavaScript rendering engine is called SpiderMonkey and here is How to Embed SpiderMonkey in your C application