I have (and still use) several Foscam standard-def cameras, but I've had a lot of trouble with HD (720p) models from Foscam and others. Can't find any which don't require ActiveX - not only for streaming, but for SETUP.
I can't give them my WiFi password without being able to run their proprietary plugin, necessarily on a Windows machine, to access the web interface. And even when I use a Windows machine and go through the process, I to end up with repeated failures.
I'm sure it must be working for someone out there, but I documented my experiences thoroughly (tried all browsers, OSX/Linux/WinXP/Win7, etc) and encountered nothing but a broad spectrum of errors.
Once they're set up, apps like tinyCam Monitor Pro (consider this a plug, it's great) can do everything you need. So if ActiveX is your only barrier, just use it for the setup stage.