MBP running hot, full fans and sluggish with both Safari and Firefox

Hi guya,
Im having problems with my kate 2007 MBP.
Im sure lately it seems to be running slower and slower and more and more sluggish - I was hoping my Mac wouldn't be subject to "slowdown" like every PC ive ever owned has.
The biggest problem is that if i use either Safari or Firefox to browse the web, they quickly start using 80-100% of my processor causing everything else to run sluggish, the computer to get hot, processors to run up to 90 degrees and fans on full.
Perhaps i multitask more than some people - I can tend ot have a lot of tabs open in Firefox, but sometimes Safari or Firefox show this behaviour with just one tab open.
I do multitask by having about 8 programs open at once and I jump from job to job, but in its early life the MBP used to deal with this - now i feel that i type faster than writing appears on screen, i have to wait ages to work in programs like indesign, and forget trying to run a game like The Sims...
Does everyone else have the 100% processor problems with Safari (and yes im on version 4, and the latest version of firefox too) the only browser which doesn't give me these problems is Opera - I can have many tabs open and it uses very little CPU, I just dont like use Opera as much as Firefox which is my browser of choice.
But why would my OSX run differently to anyone elses? Is there a problem with my Macbook, is there a problem with OSX (does it need installing again?) Is it just time for me to buy a new Macbook Pro - or if I run firefox on that will i get the same problem? Ive got nearly 30gb of spare HD space and maxed it out with 4gb of Ram - so neither of those are causing a problem either...
Any input would be great...

Have you tried restarting the comp? Sometimes a simple refresh will cure the sluggishness.
Try running repair permissions from your HD and afterwards run +repair disk+ from your software install DVD.
Regarding your comp running hot, make sure it is properly ventilated while in use. The MBP is not a laptop. According to the user manual it states in part:
+"Do not operate your MacBook Pro on a pillow or other soft material, as the material can block the airflow vents. Never place anything over the keyboard when operating your MacBook Pro. Never push objects into the ventilation openings."+

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EtreCheck version: 1.9.12 (48)
Report generated July 25, 2014 at 2:17:04 PM EDT
Hardware Information:
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    MacBook Pro - model: MacBookPro9,2
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    4 GB RAM
Video Information:
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        Color LCD 1280 x 800
System Software:
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Disk Information:
    APPLE HDD HTS547550A9E384 disk0 : (500.11 GB)
        EFI (disk0s1) <not mounted>: 209.7 MB
        Macintosh HD (disk0s2) / [Startup]: 399.25 GB (220.13 GB free)
        Recovery HD (disk0s3) <not mounted>: 650 MB
        BOOTCAMP (disk0s4) /Volumes/BOOTCAMP: 100 GB (58.85 GB free)
    HL-DT-ST DVDRW GS31N
USB Information:
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Computer, Inc. IR Receiver
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Inc. Apple Internal Keyboard / Trackpad
Thunderbolt Information:
    Apple Inc. thunderbolt_bus
Gatekeeper:
    Mac App Store and identified developers
Kernel Extensions:
    [not loaded]    com.millisecond.driver.InquisitParallelPort (2285 - SDK 10.8) Support
    [not loaded]    edu.sissa.iokit.ioLabResponseBox (2.0 - SDK 10.6) Support
Problem System Launch Daemons:
    [failed]    com.apple.installd.plist
    [failed]    com.apple.wdhelper.plist
Launch Daemons:
    [loaded]    com.adobe.fpsaud.plist Support
    [running]    com.daz3d.content_management_service.plist Support
    [loaded]    com.google.keystone.daemon.plist Support
    [loaded]    com.microsoft.office.licensing.helper.plist Support
    [loaded]    com.oracle.java.Helper-Tool.plist Support
    [loaded]    net.cloudpath.HelperTool.plist Support
Launch Agents:
    [loaded]    com.google.keystone.agent.plist Support
    [loaded]    com.oracle.java.Java-Updater.plist Support
User Login Items:
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    RescueTime
    Dropbox
    Activity Monitor
Internet Plug-ins:
    FlashPlayer-10.6: Version: 14.0.0.145 - SDK 10.6 Support
    Default Browser: Version: 537 - SDK 10.9
    Flash Player: Version: 14.0.0.145 - SDK 10.6 Support
    QuickTime Plugin: Version: 7.7.3
    o1dbrowserplugin: Version: 5.4.2.18903 Support
    SharePointBrowserPlugin: Version: 14.4.3 - SDK 10.6 Support
    googletalkbrowserplugin: Version: 5.4.2.18903 Support
    Silverlight: Version: 5.1.30317.0 - SDK 10.6 Support
    MeetingJoinPlugin: Version: (null) - SDK 10.6 Support
    JavaAppletPlugin: Version: Java 7 Update 55 Check version
Safari Extensions:
    Ebates: Version: 3.0.2.5
    Save to Pocket: Version: 1.9.1
    PriceBlink: Version: 4.1
    Evernote Web Clipper: Version: 6.1.3
    Hukkster: Version: 1.1
    Add To Amazon Wish List: Version: 1.8
    Instapaper: Version: 1.2.1
    Coupons at Checkout: Version: 1.1
Audio Plug-ins:
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    AirPlay: Version: 2.0 - SDK 10.9
    AppleAVBAudio: Version: 203.2 - SDK 10.9
    iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
    Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes:
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    Java Support
Time Machine:
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Top Processes by CPU:
        23%    firefox
         4%    WindowServer
         0%    fontd
         0%    Activity Monitor
         0%    sysmond
Top Processes by Memory:
    818 MB    firefox
    111 MB    com.apple.IconServicesAgent
    102 MB    Finder
    98 MB    Microsoft Word
    94 MB    mds_stores
Virtual Memory Information:
    311 MB    Free RAM
    1.49 GB    Active RAM
    1.22 GB    Inactive RAM
    895 MB    Wired RAM
    3.49 GB    Page-ins
    159 MB    Page-outs
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