Did anyone read the information provided by Mozilla on FF7 http://www.mozilla.org/en-US/firefox/performance this will let you know that they have added accelerators to the new version and there is new Java plugins that could assist your issues with FF. Please read because you can turn it off in about:config if your system cant handle it but I recommend against it. Also the hacks still work and the NO SCRIPT plugin is also an excellent idea. See people don't understand FF is like the Linux of browsers you can tinker with it and make it work for you the way you want if you have the know how. But, as for me I can use it as is and it works fine for me. That's not an opinion its a fact and I have two weak systems one is an IBM Thinkpad with 4GB of ram XPSP3 and a Dual Core processor, My other system is a DELL Latitude 830 with 4GB of ram XPSP3 and a Core2Duo processor and I only use WIFI at 2.5GHZ and i get excellent FF7 usage on both. Also note that if FF7uses accelerators for Facebook because its a large site and of course you will see a spike in your resources but is it a problem? I think not I feel that if it causes your other programs to slow down maybe you should add more ram, other than that try to limit what you have open at the same time. Rather minimize you resource usage by turning off some programs if you system cant handle it. I understand the face that if you are utilizing 75% of your processor you are actually in a good state because you are actually using what your system has. I mean really try adding some virtual memory to your system and you will see that your issues you claim are so... be of no concern. A spike in resources on your system is normal when visiting a big site or running a program and is normal.
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