Despite trying everything that people have suggested in other forums, I cannot remove the horrible Yahoo extention that has attached itself to my Firefox

Despite many people suggesting that you go to Add on's, then Extenstions under the Tools menu, no extensions come up.
This disgusting Yahoo program is totally ruining my Firefox experience and I want to get rid of it and re-claim my browser and screen!
Any help would be appreciated.

Application Basics
Name
Firefox
Version
14.0.1
User Agent
Mozilla/5.0 (Windows NT 5.1; rv:14.0) Gecko/20100101 Firefox/14.0.1
Profile Folder
Show Folder
Enabled Plugins
about:plugins
Build Configuration
about:buildconfig
Crash Reports
about:crashes
Memory Use
about:memory
Extensions
Name
Version
Enabled
ID
Important Modified Preferences
Name
Value
accessibility.typeaheadfind.flashBar
0
browser.cache.disk.capacity
1048576
browser.cache.disk.smart_size.first_run
false
browser.cache.disk.smart_size_cached_value
655360
browser.places.smartBookmarksVersion
4
browser.search.param.yahoo-fr
w3i&type=W3i_DS,157,0_0,Search,20120624,17023,0,29,0
browser.search.useDBForOrder
true
browser.startup.homepage_override.buildID
20120713134347
browser.startup.homepage_override.mstone
14.0.1
browser.tabs.warnOnClose
false
extensions.lastAppVersion
14.0.1
general.useragent.extra.microsoftdotnet
( .NET CLR 3.5.30729)
gfx.blacklist.suggested-driver-version
10.6
network.cookie.prefsMigrated
true
places.database.lastMaintenance
1344338950
places.history.expiration.transient_current_max_pages
33527
places.history.expiration.transient_optimal_database_size
24431575
places.last_vacuum
1302302326
print.print_printer
HP LaserJet 4 Plus
print.printer_HP_LaserJet_4_Plus.print_bgcolor
false
print.printer_HP_LaserJet_4_Plus.print_bgimages
false
print.printer_HP_LaserJet_4_Plus.print_command
print.printer_HP_LaserJet_4_Plus.print_downloadfonts
false
print.printer_HP_LaserJet_4_Plus.print_edge_bottom
0
print.printer_HP_LaserJet_4_Plus.print_edge_left
0
print.printer_HP_LaserJet_4_Plus.print_edge_right
0
print.printer_HP_LaserJet_4_Plus.print_edge_top
0
print.printer_HP_LaserJet_4_Plus.print_evenpages
true
print.printer_HP_LaserJet_4_Plus.print_footercenter
print.printer_HP_LaserJet_4_Plus.print_footerleft
&PT
print.printer_HP_LaserJet_4_Plus.print_footerright
&D
print.printer_HP_LaserJet_4_Plus.print_headercenter
print.printer_HP_LaserJet_4_Plus.print_headerleft
&T
print.printer_HP_LaserJet_4_Plus.print_headerright
&U
print.printer_HP_LaserJet_4_Plus.print_in_color
true
print.printer_HP_LaserJet_4_Plus.print_margin_bottom
0.5
print.printer_HP_LaserJet_4_Plus.print_margin_left
0.5
print.printer_HP_LaserJet_4_Plus.print_margin_right
0.5
print.printer_HP_LaserJet_4_Plus.print_margin_top
0.5
print.printer_HP_LaserJet_4_Plus.print_oddpages
true
print.printer_HP_LaserJet_4_Plus.print_orientation
0
print.printer_HP_LaserJet_4_Plus.print_page_delay
50
print.printer_HP_LaserJet_4_Plus.print_paper_data
9
print.printer_HP_LaserJet_4_Plus.print_paper_height
11.00
print.printer_HP_LaserJet_4_Plus.print_paper_size_type
0
print.printer_HP_LaserJet_4_Plus.print_paper_size_unit
1
print.printer_HP_LaserJet_4_Plus.print_paper_width
8.50
print.printer_HP_LaserJet_4_Plus.print_reversed
false
print.printer_HP_LaserJet_4_Plus.print_scaling
1.00
print.printer_HP_LaserJet_4_Plus.print_shrink_to_fit
true
print.printer_HP_LaserJet_4_Plus.print_to_file
false
print.printer_HP_LaserJet_4_Plus.print_unwriteable_margin_bottom
0
print.printer_HP_LaserJet_4_Plus.print_unwriteable_margin_left
0
print.printer_HP_LaserJet_4_Plus.print_unwriteable_margin_right
0
print.printer_HP_LaserJet_4_Plus.print_unwriteable_margin_top
0
privacy.sanitize.migrateFx3Prefs
true
security.warn_viewing_mixed
false
Graphics
Adapter Description
ATI MOBILITY RADEON 7500
Vendor ID
0x1002
Device ID
0x4c57
Adapter RAM
Unknown
Adapter Drivers
ati2dvag
Driver Version
6.14.10.6525
Driver Date
3-22-2005
WebGL Renderer
Blocked for your graphics driver version. Try updating your graphics driver to version 10.6 or newer.
GPU Accelerated Windows
0. Blocked for your graphics driver version. Try updating your graphics driver to version 10.6 or newer.
JavaScript
Incremental GC
1
Library Versions
Expected minimum version
Version in use
NSPR
4.9
4.9
NSS
3.13.5.0 Basic ECC
3.13.5.0 Basic ECC
NSS Util
3.13.5.0
3.13.5.0
NSS SSL
3.13.5.0 Basic ECC
3.13.5.0 Basic ECC
NSS S/MIME
3.13.5.0 Basic ECC
3.13.5.0 Basic ECC

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