Do you have some kind of Yahoo Toolbar installed?

Copy contents from Help->Troubleshooting information and paste them into your reply so that supporters knew more about possible causes of the problem.

No I dont think that I do.

Copy contents from Help->Troubleshooting information and paste them into your reply, please.

 Application Basics

       Name
       Firefox

       Version
       3.6.3

       Profile Directory

         Open Containing Folder

       Installed Plugins

         about:plugins

       Build Configuration

         about:buildconfig

 Extensions

       Name

       Version

       Enabled

       ID

       Norton IPS
       1.0
       true
       {8545daff-ad1e-493f-a37e-eed1ac79682b}

       Java Console
       6.0.15
       true
        

       Java Console
       6.0.17
       true
        

       Personas
       1.5.1
       true
       personas@christopher.beard

       LimeWire Toolbar
       3.6.6.117
       true
       toolbar@ask.com

       Microsoft .NET Framework Assistant
       1.1
       true
       {20a82645-c095-46ed-80e3-08825760534b}

       Beemp3 Search ToolBar
       1.0.0
       true
       {2832ABCD-4444-1012-2D45-132D5447C445}

       VidToMP3.com Toolbar
       1.0
       true
        

       Norton Toolbar
       3.7.2
       true
       {7BA52691-1876-45ce-9EE6-54BCB3B04BBC}

       DigitalPersona Extension
       5.0.0.3790
       true
       otis@digitalpersona.com

       DVDVideoSoft Menu
       1.0.1
       true
        

       Veoh Video Compass
       1.5.2
       true
       searchrecs@veoh.com

       Java Console
       6.0.20
       true
        

 Modified Preferences

     Name

     Value

       accessibility.typeaheadfind.flashBar
       0

       browser.history_expire_days.mirror
       180

       browser.places.smartBookmarksVersion
       2

       browser.startup.homepage
       http://www.google.ca/|http://www.mozilla.com/en-US/firefox/tabs.html

       browser.startup.homepage_override.mstone
       rv:1.9.2.3

       extensions.lastAppVersion
       3.6.3

       general.useragent.extra.microsoftdotnet
       (.NET CLR 3.5.30729)

       javascript.options.showInConsole
       true

       keyword.URL
       http://urlseek.vmn.net/search.php?type=dns&tbn=vidtomp3dn&q=

       network.cookie.prefsMigrated
       true

       network.protocol-handler.warn-external.dnupdate
       false

       places.last_vacuum
       1268364777

       print.print_printer
       HP PSC 1500 series

       print.printer_HP_PSC_1500_series.print_bgcolor
       false

       print.printer_HP_PSC_1500_series.print_bgimages
       false

       print.printer_HP_PSC_1500_series.print_command

       print.printer_HP_PSC_1500_series.print_downloadfonts
       false

       print.printer_HP_PSC_1500_series.print_edge_bottom
       0

       print.printer_HP_PSC_1500_series.print_edge_left
       0

       print.printer_HP_PSC_1500_series.print_edge_right
       0

       print.printer_HP_PSC_1500_series.print_edge_top
       0

       print.printer_HP_PSC_1500_series.print_evenpages
       true

       print.printer_HP_PSC_1500_series.print_footercenter

       print.printer_HP_PSC_1500_series.print_footerleft
       &PT

       print.printer_HP_PSC_1500_series.print_footerright
       &D

       print.printer_HP_PSC_1500_series.print_headercenter

       print.printer_HP_PSC_1500_series.print_headerleft
       &T

       print.printer_HP_PSC_1500_series.print_headerright
       &U

       print.printer_HP_PSC_1500_series.print_in_color
       true

       print.printer_HP_PSC_1500_series.print_margin_bottom
       0.5

       print.printer_HP_PSC_1500_series.print_margin_left
       0.5

       print.printer_HP_PSC_1500_series.print_margin_right
       0.5

       print.printer_HP_PSC_1500_series.print_margin_top
       0.5

       print.printer_HP_PSC_1500_series.print_oddpages
       true

       print.printer_HP_PSC_1500_series.print_orientation
       0

       print.printer_HP_PSC_1500_series.print_pagedelay
       500

       print.printer_HP_PSC_1500_series.print_paper_data
       9

       print.printer_HP_PSC_1500_series.print_paper_height
       11.00

       print.printer_HP_PSC_1500_series.print_paper_size_type
       0

       print.printer_HP_PSC_1500_series.print_paper_size_unit
       1

       print.printer_HP_PSC_1500_series.print_paper_width
       8.50

       print.printer_HP_PSC_1500_series.print_reversed
       false

       print.printer_HP_PSC_1500_series.print_scaling
       1.00

       print.printer_HP_PSC_1500_series.print_shrink_to_fit
       true

       print.printer_HP_PSC_1500_series.print_to_file
       false

       print.printer_HP_PSC_1500_series.print_unwriteable_margin_bottom
       0

       print.printer_HP_PSC_1500_series.print_unwriteable_margin_left
       0

       print.printer_HP_PSC_1500_series.print_unwriteable_margin_right
       0

       print.printer_HP_PSC_1500_series.print_unwriteable_margin_top
       0

       privacy.popups.showBrowserMessage
       false

       privacy.sanitize.migrateFx3Prefs
       true

       privacy.sanitize.timeSpan
       3

       security.warn_viewing_mixed
       false

Is it the Yahoo page about which you complain?

http://urlseek.vmn.net/search.php?type=dns&tbn=vidtomp3dn&q...

It is set now in your preferences that when you type something in location bar (not website address, but search keywords), this page is used.

I'm afraid this is set by one of your toolbars. Googling says many different Firefox extensions ("search settings", PDFforge, "UltraEdit toolbar", "Multiply Toolbar") can cause it.

Disable a suspected toolbar in Tools->Add-ons->Extensions, restart Firefox, go to about:config, click button "I'll be careful", type or paste "keyword.url" (without quotes) into the Filter textbox, reset/modify the preference to anything else (without urlseek) and then test it. If some time later urlseek will return, another toolbar is the culprit, so go through the algorithm again.

When urlseek doesn't appear anymore, you have disabled the culprit toolbar, so you can try to restore other toolbars, one-by-one, carefully (maybe, more than one toolbar was causing it).

Je ne comprand pas

Extensions

      Name

      Version

      Enabled

      ID

      Norton IPS
      1.0
      true
      {8545daff-ad1e-493f-a37e-eed1ac79682b}

      Java Console
      6.0.15
      true
       

      Java Console
      6.0.17
      true
       

      Personas
      1.5.1
      true
      personas@christopher.beard

      LimeWire Toolbar
      3.6.6.117
      true
      toolbar@ask.com

      Microsoft .NET Framework Assistant
      1.1
      true
      {20a82645-c095-46ed-80e3-08825760534b}

      Beemp3 Search ToolBar
      1.0.0
      true
      {2832ABCD-4444-1012-2D45-132D5447C445}

     Freeyoutubetomp3converter.org Toolbar
      1.0
      true
       free youtube to mp3 converter

      Norton Toolbar
      3.7.2
      true
      {7BA52691-1876-45ce-9EE6-54BCB3B04BBC}

      DigitalPersona Extension
      5.0.0.3790
      true
      otis@digitalpersona.com

      DVDVideoSoft Menu
      1.0.1
      true

Here’s the easy, get rid of it for good fix: It’s done within Firefox. Enter [about:config] in the url address box. Click “I’ll be careful. I promise”. In the <filter> field, type “extensions.netassistant” (no quotes). Right click on the field: “extensions.netassistant.tabsearch.url”, click on <modify>, either delete its string or enter your own. I’ve entered “https://encrypted.google.com” (this is a beta encrypted search by Google) just as a personal satisfaction against Yahoo. Do the same for:”extensions.netassistant.url” field. NOTE: If you haven’t modified your Firefox configuration before and you don’t feel comfortable in what you are about to do, BACKUP! The backup procedure can be found at: http://support.mozilla.com/en-US/kb/backing%20up%20your%20information. Or just do a Google search for “backup Firefox pref.js”.

Je ne comprand pas. Pouvez-vous m'espliquez?

Extensions

     Name

     Version

     Enabled

     ID

     Norton IPS
     1.0
     true
     {8545daff-ad1e-493f-a37e-eed1ac79682b}

     Java Console
     6.0.15
     true
      

     Java Console
     6.0.17
     true
      

     Personas
     1.5.1
     true
     personas@christopher.beard

     LimeWire Toolbar
     3.6.6.117
     true
     toolbar@ask.com

     Microsoft .NET Framework Assistant
     1.1
     true
     {20a82645-c095-46ed-80e3-08825760534b}

     Beemp3 Search ToolBar
     1.0.0
     true
     {2832ABCD-4444-1012-2D45-132D5447C445}

    Convert-youtube-to-mp3.com Toolbar
     1.0
     true
      convert youtube to mp3 Convert youtube to mp3
     Norton Toolbar
     3.7.2
     true
     {7BA52691-1876-45ce-9EE6-54BCB3B04BBC}
    What is a computer virus What is a computer virus
     DigitalPersona Extension
     5.0.0.3790
     true
     otis@digitalpersona.com

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     DVDVideoSoft Menu
     1.0.1
     true

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How To Stop Firefox From Displaying Most Visited Sites when Opening A New Tab:

From Mozzilla's own page here: http://support.mozilla.org/en-US/kb/new-tab-page-show-hide-and-customize-top-sites?s=how+to+stop+new+tabs+from+showing+most+visited+&r=1&e=es&as=s

If you are concerned about your privacy, you can turn this feature off completely: 1. In the Location bar, type about:config and press Enter.

o The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!, to continue to the about:config page.

2. Type browser.newtab.url in the search box.

3. Double-click the browser.newtab.url preference and change the url from about:newtab to about:blank.

4. Click OK and close the about:config tab.