I've got an IP-web-cam that when I access it using firefox, it keeps insisting that I have a missing plug-in and when I click on the "install plugin" link, it wants me to install the java JRE version 1.7.something. I already have the 1.6.something installed and working, so I don't know why it thinks it needs to install the JRE.
I've come across this elsewhere on the web:
I troubleshot the Firefox installation and found an incompatibility with /library/internet plug-ins/javaplugincocoa.bundle. Once that plug-in was removed, the video stream worked under Firefox with the same ultracam applet. Also tested successfully with Opera v9.62.
This guy had the same camera, but found a way to get the streaming working on a mac (I'm on windows). I think the problem is with the file ultracam.jar. When I try to "install" it (by double-clicking on it) I get "Failed to load Main-Class manifest attribute". When I unpack it and look at manifest.mf, I don't see "Main-Class". What I see is: