My system hangs on multiple tabs in Firefox

[zaibatt]

My system ( CPU 2.40 GHz & 512 MB of RAM ) hangs as I open more than 50 tabs in Mozilla Firefox. I want to open approx 500 tabs for off-page SEO work ( Multiple sites ) at a time in Firefox browser …..................... Should I increase its memory or CPU or both or any other idea to improve the PC performance?

 

[Equinox1354]

Upgrade RAM to 2GB

 

[jmacavali]

Is it possible for Firefox to even open that many? It could be the browser hanging and not the computers fault.