Very Slow Firefox

Hi! I have recently been experiencing problems with Firefox - new tabs take ages to appear, navigating through tabs is a drag, videos do not play properly, typing is very slow, the thinking ball appears randomly etc. By now I am quite frustrated, especially since deleting cache and cookies twice, or restarting my Mac twice did not seem to help. Performance improves for a bit, but then is back to its slow self. I ran EtreCheck (output below), but do not know how to decrease its process memory usage (if that is the problem). Finally, this has never happenned before.
Thanks a lot guys!
Hardware Information:
    MacBook Pro (15-inch, Late 2011)
    MacBook Pro - model: MacBookPro8,2
    1 2.2 GHz Intel Core i7 CPU: 4 cores
    4 GB RAM
Video Information:
    AMD Radeon HD 6750M - VRAM: 512 MB
    Intel HD Graphics 3000 - VRAM: 384 MB
System Software:
    Mac OS X 10.7.5 (11G63b) - Uptime: 3 days 20:26:24
Disk Information:
    ST9500325ASG disk0 : (500.11 GB)
        disk0s1 (disk0s1) <not mounted>: 209.7 MB
        Macintosh HD (disk0s2) / [Startup]: 499.25 GB (248.09 GB free)
        Recovery HD (disk0s3) <not mounted>: 650 MB
    MATSHITADVD-R   UJ-8A8
USB Information:
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Inc. BRCM2070 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Computer, Inc. IR Receiver
FireWire Information:
Thunderbolt Information:
    Apple, Inc. MacBook Pro
Launch Daemons:
    [System]    com.adobe.fpsaud.plist 3rd-Party support link
    [System]    com.microsoft.office.licensing.helper.plist 3rd-Party support link
    [System]    com.oracle.java.Helper-Tool.plist 3rd-Party support link
    [System]    com.oracle.java.JavaUpdateHelper.plist 3rd-Party support link
    [System]    PPPMonitord.plist 3rd-Party support link
Launch Agents:
    [System]    com.oracle.java.Java-Updater.plist 3rd-Party support link
    [System]    Swapper.plist 3rd-Party support link
User Launch Agents:
    [not loaded]    com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist
    [not loaded]    com.facebook.videochat.[redacted].plist 3rd-Party support link
    [not loaded]    com.valvesoftware.steamclean.plist 3rd-Party support link
User Login Items:
    gfxCardStatus
    iTunesHelper
    smcFanControl
Internet Plug-ins:
    FlashPlayer-10.6: Version: 13.0.0.201 - SDK 10.6 3rd-Party support link
    Flash Player: Version: 13.0.0.201 - SDK 10.6 3rd-Party support link
    QuickTime Plugin: Version: 7.7.1
    JavaAppletPlugin: Version: Java 7 Update 51 Outdated! Update
    SharePointBrowserPlugin: Version: 14.2.0 - SDK 10.6 3rd-Party support link
Safari Extensions:
    iTube Studio: Version: 2.4.0.61
Audio Plug-ins:
    iSightAudio: Version: 7.7.1 - SDK 10.7
iTunes Plug-ins:
    Quartz Composer Visualizer: Version: 1.3 - SDK 10.7
User Internet Plug-ins:
    WebEx64: Version: 1.0 - SDK 10.5 3rd-Party support link
    Google Earth Web Plug-in: Version: 7.1 3rd-Party support link
3rd Party Preference Panes:
    Flash Player 3rd-Party support link
    Java 3rd-Party support link
Old Applications:
    LIMBO:    Version: 1.0.0 - SDK 10.0 3rd-Party support link
    iCarambaSpanishDictionary:    Version: 1.0 - SDK 10.0 3rd-Party support link
Time Machine:
    Time Machine not configured!
Top Processes by CPU:
        20%    firefox
         9%    WindowServer
         3%    plugin-container
         2%    hidd
         2%    EtreCheck
Top Processes by Memory:
    1.20 GB    firefox
    160 MB    plugin-container
    147 MB    System Preferences
    115 MB    Finder
    98 MB    mds
Virtual Memory Information:
    259 MB    Free RAM
    1.80 GB    Active RAM
    1.03 GB    Inactive RAM
    932 MB    Wired RAM
    4.20 GB    Page-ins
    1.57 GB    Page-outs

EDIT: Oh, and you have very little free RAM and lots of Page Outs. So, in fact, first thing to do is to simply restart and only have FF open and test.
First thing to do is to start FF in Safe Mode and see how it's working. This will temporarily disable all Add-ons and use a clean Profile. If it's running OK there, then it's time to look at your Add-ons to find a culprit, or start with a new clean Profile.
Hold down the Option (alt) key when opening FF.
You should also get rid of the steam clean thing. Those cleaning programs, if that's what this thing is, are dangerous and not needed.
Message was edited by: WZZZ

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EDIT: Oh, and you have very little free RAM and lots of Page Outs. So, in fact, first thing to do is to simply restart and only have FF open and test.
First thing to do is to start FF in Safe Mode and see how it's working. This will temporarily disable all Add-ons and use a clean Profile. If it's running OK there, then it's time to look at your Add-ons to find a culprit, or start with a new clean Profile.
Hold down the Option (alt) key when opening FF.
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Message was edited by: WZZZ

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