The most common reason for not being able to connect to the internet after upgrading is your firewall keeping an unrecognized program, including a new version of an existing program, from connecting. Check your firewall. Remove any permissions for Firefox from your firewall programs list, let the firewall re-detect the new Firefox, and give the proper permissions for Firefox to connect. *See: http://support.mozilla.com/en-US/kb/Cannot+connect+after+upgrading+Firefox ---------------------------- <br /> '''Other issues that need your attention.''' The information submitted with your question indicates that you have out of date plugins with known security and stability issues that should be updated. To see the plugins submitted with your question, click "More system details..." to the right of your original question post. *Adobe PDF Plug-In For Firefox and Netscape "9.3.4" **New Adobe Reader X (version 10) with Protected Mode just released 2010-11-19 **See: http://www.securityweek.com/adobe-releases-acrobat-reader-x-protected-mode *Shockwave Flash 10.1 r53 *Java Plug-in 1.6.0_03 for Netscape Navigator (DLL Helper) #'''Check your plugin versions''': http://www.mozilla.com/en-US/plugincheck/ #*'''Note: plugin check page does not have information on all plugin versions''' #'''Update Adobe Reader (PDF plugin):''' #*From within your existing Adobe Reader ('''<u>if you have it already installed</u>'''): #**Open the Adobe Reader program from your Programs list #**Click Help > Check for Updates #**Follow the prompts for updating #**If this method works for you, skip the "Download complete installer" section below and proceed to "After the installation" below #*Download complete installer ('''if you do <u>NOT</u> have Adobe Reader installed'''): #**Use the links below to avoid getting the troublesome "getplus" Adobe Download Manager and other "extras" you may not want #**Use Firefox to download and SAVE the installer to your hard drive from the appropriate link below #**Click "Save to File"; save to your Desktop (so you can find it) #**After download completes, close Firefox #**Click the installer you just downloaded and allow the install to continue #***Note: Vista and Win7 users may need to right-click the installer and choose "Run as Administrator" #**'''<u>Download link</u>''': ftp://ftp.adobe.com/pub/adobe/reader/ #***Choose your OS #***Choose the latest #.x version (example 9.x, for version 9) #***Choose the highest number version listed #****NOTE: 10.x is the new Adobe Reader X (Windows and Mac only as of this posting) #***Choose your language #***Download the file #***Windows: choose the .exe file; Mac: choose the .dmg file #*Using either of the links below will force you to install the "getPlus" Adobe Download Manager. Also be sure to uncheck the McAfee Scanner if you do not want the link forcibly installed on your desktop #**''<u>Also see Download link</u>''': http://get.adobe.com/reader/otherversions/ #**Also see: https://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox (do not use the link on this page for downloading; you may get the troublesome "getplus" Adobe Download Manager (Adobe DLM) and other "extras") #*After the installation, start Firefox and check your version again. #'''Update the [[Managing the Flash plugin|Flash]] plugin''' to the latest version. #*Download and SAVE to your Desktop so you can find the installer later #*If you do not have the current version, click on the "Player Download Center" link on the "'''Download and information'''" or "'''Download Manual installers'''" below #*After download is complete, exit Firefox #*Click on the installer you just downloaded and install #**Windows 7 and Vista: may need to right-click the installer and choose "Run as Administrator" #*Start Firefox and check your version again or test the installation by going back to the download link below #*'''Download and information''': http://www.adobe.com/software/flash/about/ #**Use Firefox to go to the above site to update the Firefox plugin (will also install plugin for most other browsers; except IE) #**Use IE to go to the above site to update the IE ActiveX #*'''Download Manual installers'''. Note separate links for: #**Plugin for Firefox and most other browsers #**ActiveX for IE #'''Update the [[Java]] plugin''' to the latest version. #*Firefox 3.6.x needs at least version 1.6.0_10; you have version 1.6.0_03; current version is 1.6.0_22 #*Download site: http://java.sun.com/javase/downloads/index.jsp (Java Platform: Download JRE) #*Also see "Manual Update" in this article: http://support.mozilla.com/en-US/kb/Using+the+Java+plugin+with+Firefox#Updates #* Removing old versions (if needed): http://www.java.com/en/download/faq/remove_olderversions.xml #* Remove multiple Java Console extensions (if needed): http://kb.mozillazine.org #*Java Test: http://www.java.com/en/download/help/testvm.xml

If you are sure you have FF 3.6.3 I would suggest keeping it and not upgrade. I have had problems with FF every since it upgraded me. It runs slower, hangs up and crashes while using some sites. I wish there was a way to back to previous version and not allow automatic updates.