Do browser plugins work the same on Macs as on PCs?

"whether or not webpages will display the same as they do on Windows."

I have more than one Windows machine. Web pages do not look exactly the same on each machine. And on the Mac they change every so slightly just like I see on the Windows machines. As to plugins, if they are available they work the same.

Bob

Most web pages, with the exception of those that are still created exclusively for IE, will display correctly using the supplied browser in OS X, Safari.
Also available, to name just a few, are FireFox, Netscape, Camino and Mozzilla. All are available at the price of an Internet connection.

ActiveX does not work at all on a Mac so you do not have to worry about that. Unless you are currently using a cross-platform browser, IE is NOT one of those, the same plugins that you are using now will work with the Mac version of that browser. Note that you will not be transferring this type of stuff from your Windows machine to your Mac.
Programs written for Windows will not run natively on a Mac. If it has the suffix .exe, it will not run.
That said, BootCamp from Apple, will allow you to install XP or Vista on your partitioned Mac HD. When booted, you get the choice of OS's.
Alternatively, you can run programs such as Parallels or VMFusion, which create a virtual machine which is capable of running every version of Windows from 3.1 up, Linux (most flavors) and a bunch of others.

P