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Hi - I am a new member here. I am not a savvy computer user, so please forgive any errors.
The Firefox browser on my XP seems to use a lot of CPU capacity. I can hear my computer whirring louder and louder. When I open Task Manager and check the "CPU Usage" at the bottom, it typically is running at 40% - 60% (sometimes faster).
The first thing I will suggest to you, is check that it is actually Firefox using all of that CPU.
Go into Task Manager, click on the Processes tab, and look for Firefox.exe, then look across and check that the cpu is from that process.
Please PM me if i have been assisting you and do not reply for 24 hours!