Wondering if I should upgrade from OS 10.6.8 to yosemite as search engines are acting a little weird - fan can come on, slow to shut down and also concerned about Security as my OS is older and no longer upgraded etc...?

Problem description:
Wondering if I should upgrade to Yosemite from Mac pro 10.6.8  as search engines are not always responding well - Fan comes on with firefox/safari is not always responding on some sites - also concerned about security issues as my system is older and not able to receive ? I have used etrecheck and copied results here - Any help/suggestions much appreciated  - Thanks kindly!
EtreCheck version: 2.1.8 (121)
Report generated February 7, 2015 10:41:15 AM EST
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    MacBook Pro (13-inch, Early 2011) (Technical Specifications)
    MacBook Pro - model: MacBookPro8,1
    1 2.3 GHz Intel Core i5 CPU: 2-core
    4 GB RAM
        BANK 0/DIMM0
            2 GB DDR3 1333 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1333 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless:  en1: 802.11 a/b/g/n
    Battery Health: Normal - Cycle count 303
Video Information: ℹ️
    Intel HD Graphics 3000 - VRAM: 384 MB
        Color LCD 1280 x 800
System Software: ℹ️
    Mac OS X 10.6.8 (10K549) - Time since boot: 1:24:41
Disk Information: ℹ️
    Hitachi HTS545032B9A302 disk0 : (298.09 GB)
        - (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 319.73 GB (198.41 GB free)
    OPTIARC DVD RW AD-5970H
USB Information: ℹ️
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. BRCM2070 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
    Apple, Inc. MacBook Pro
Configuration files: ℹ️
    /etc/hosts - Count: 15
Kernel Extensions: ℹ️
        /System/Library/Extensions
    [not loaded]    com.olympus.DSSBlockCommandsDevice (1.1.0) [Click for support]
Problem System Launch Daemons: ℹ️
    [not loaded]    org.samba.winbindd.plist [Click for support]
Launch Agents: ℹ️
    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [loaded]    com.adobe.CS5ServiceManager.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.adobe.SwitchBoard.plist [Click for support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.google.keystone.agent.plist [Click for support]
User Login Items: ℹ️
    Flux    Application  (/Applications/Flux.app)
Internet Plug-ins: ℹ️
    JavaAppletPlugin: Version: 13.9.8 - SDK 10.6 Check version
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.6.6
    AdobePDFViewerNPAPI: Version: 10.1.12 [Click for support]
    AdobePDFViewer: Version: 10.1.12 [Click for support]
    DivXBrowserPlugin: Version: 1.4 [Click for support]
    Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    SharePointBrowserPlugin: Version: 14.1.0 [Click for support]
    Google Earth Web Plug-in: Version: 7.1 [Click for support]
    Silverlight: Version: 4.1.10329.0 [Click for support]
    iPhotoPhotocast: Version: 7.0 - SDK 10.7
Audio Plug-ins: ℹ️
    iSightAudio: Version: 7.6.6
3rd Party Preference Panes: ℹ️
    Flash Player  [Click for support]
    Growl  [Click for support]
Time Machine: ℹ️
    Time Machine information requires OS X 10.7 "Lion" or later.
Top Processes by CPU: ℹ️
         7%    WindowServer
         1%    plugin-container
         1%    firefox
         0%    fontd
         0%    Flux
Top Processes by Memory: ℹ️
    515 MB    firefox
    52 MB    mds
    43 MB    WindowServer
    43 MB    Finder
    34 MB    plugin-container
Virtual Memory Information: ℹ️
    2.14 GB    Free RAM
    745 MB    Active RAM
    475 MB    Inactive RAM
    929 MB    Wired RAM
    231 MB    Page-ins
    0 B    Page-outs
Diagnostics Information: ℹ️
    Feb 7, 2015, 09:16:09 AM    Self test - passed

... Fan comes on with firefox/safari is not always responding on some sites -
An SMC reset may resolve the otherwise inexplicable fan behaviour. Be sure to read the procedure carefully and follow all the steps exactly as written, even if they seem inapplicable or trivial.
Fixing a modified Hosts file requires specific instructions. Apple Support Communities contributor and EtreCheck author etresoft recently added a User Tip discussing that concern, and how to correct it: Fixing a hacked /etc/hosts file
Back up your Mac prior to making any changes to its file system. To learn how to use Time Machine read Mac Basics: Time Machine backs up your Mac.

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