I recently checked my plugins in Firefox, and it said the Shockwave Flash plugin was vulnerable. I clicked update now, went through the steps on the adobe site, and restarted my browser. Upon restart, i checked my plugins again, and it still said Shockwave was vulnerable. I've tried updating multiple times, and the same thing happens every time. What should i do?

You just have to restart your computer, then the web-browser will reset :)