Why FF usaes 25% of CPU, even after closing the application..?

After opening two or more browser, automatically FF stars using 24/25% of CPU.
Even one tab having Youtube running.
As well as using huge amount of memory, and this gradually increases.
Closing the application doesn't solves the problem.
After that the application doesn't opens. A window appears and shows.. Firefox already running and is not responding.
Going to Task manager and kill the process solves the problem.
And it's happening every time.
In cyclic order need to follow the annoying process.
.....Tried the processes but NO result found.....
Re-installation of FF didn't worked.
Re-installed Flash player.
No malware found by Malwarebytes.
Even tried running FF in safe mode. (disabling all plugin and extensions)
And the result is.... NO progress. CPU 25% usage and had to kill the task.
Please some one help.
(OS: windows 7 professional)

Your computer isn't getting slower, it's other things demanding faster. If you are installing all the possible updates to software those will be designed for newer computers. Once you start browsing you're browsing a web designed by people who because they spend all their time designing pages they themselves have powerful machines with fast connections because it is their job. It's like if all city streets were designed by racecar drivers. A 2008 computer is already considered vintage by Apple and close to no longer being supported in any manner. Vintage and obsolete products - http://support.apple.com/kb/HT1752 I have an even older computer than you and it is annoying but that's the way things are.
Frankly 4-6 icon bounces doesn't sound long to me. Don't forget that for applications such as iTunes how long it takes to open will also depend upon the size of the library.
I don't think CPUs wear down. Conceivably some slow-down could be the result of excessive bad sectors on a hard drive but you say you replaced that (and I would expect it to have shown more serious symptoms were that happening).
You can use Activity monitor to check your RAM usage. Newer applications and newer OS versions will require much more RAM than posted "minimum" If a computer doesn't have enough RAM it starts using the hard drive which is slower than chips.

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Message was edited by: Ravi Pasumarty

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Why FF usaes 25% of CPU, even after closing the application..?

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