I am running Firefox 3.6.3 I attempted to upgrade to 3.6.13 and am unsuccessful. Error message is somehthing like "unknwon web site".

Using 3.6.3 succesfully. No problems. Tried to upgrade to 3.6.13 and after uploading cannot attach to Internet.

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
 
'''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The information submitted with your question indicates that you have out of date plugins with known security and stability issues that should be updated.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 ('''if you have it already installed'''):
#**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 NOT 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"
#**'''Download link''': 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
#**''Also see Download link''': 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

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I use Firefox to access my college's website and my account there. Ever since I downloaded the new Firefox, I can't log in to my account at my college and I get error messages. What's wrong?

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The following article details several things that can be done to quell iTunes' constant need for authorization.
iTunes repeatedly prompts to authorize computer to play iTunes Store purchases
http://support.apple.com/kb/TS1389
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* https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
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== This happened ==
A few times a week
== Upgraded to 3.6.3.

Many thanks.
With those symptoms, I'd try the following document:
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Then there is something seriously wrong with either your
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Trying to download updates to Firefox 6.0.1 and am receiving error messages.

Which error messages do you get?
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Download a fresh Firefox copy and save the file to the desktop.
* Firefox 6.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/Profile_backup
There are other things that need your attention.
Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.
*Next Generation Java Plug-in 1.6.0_16 for Mozilla browsers
*http://www.mozilla.com/plugincheck/
Update the Java plugin to the latest version.
*https://support.mozilla.com/kb/Using+the+Java+plugin+with+Firefox
*http://kb.mozillazine.org/Java
*http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)

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Run the Firefox program once as Administrator (right-click: Run as Administrator). 
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Do a clean (re-)install:
* Download a fresh Firefox copy and save the file to the desktop.
* http://www.mozilla.com/firefox/all.html
* Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
* Don't remove personal data if you uninstall the current version.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere (not in the Firefox program folder) and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.

Why, when I open Firefox 4, do I keep having Firefox 3 pop up continually and having the error message "A copy of Firefox is already open. Only one copy of Firefox can be open at a time." ?

Every time that I try to use Firefox 4, Firefox 3 pops up on the Dock and tries to start up. I get the error message "A copy of Firefox is already open. Only one copy of Firefox can be open at a time." I click OK and the message goes away. Then it happens again. And again. It doesn't stop until I quit Firefox 4. I've tried creating a new profile (and deleting my old one) and deleting the .parentlock and the profile.ini file, but nothing works. Help me please!

See:
* https://support.mozilla.com/kb/Firefox+is+already+running+but+is+not+responding

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Running Windows 7 on one partition, and Windows 8 Consumer Preview on another, Firefox does not open for either.
Firefox crashes upon opening without an error message. I have reinstalled and manually cleared profile information. If I create a new profile, it works until I close and try to relaunch requiring me to make a new profile.
I have tried removing/reinstalling java as well (just in case), as I had been editing some of the java installation from my Windows 7 partition.
As I launch the Firefox, if I watch the task manager, Firefox.exe appears for a moment, but disappears almost immediately.
No files appear in 'C:\Users\[Username]\AppData\Roaming\Mozilla\Firefox\Crash Reports' directory with the exception of the 'InstallTime*********' file.
*Information posted in the "Troubleshooting Information" section below is from the Windows 8 Consumer Preview partition. There are some errors with my display driver not being updated properly, but Firefox -was- working on Windows 8 Consumer Preview until just recently, so I am assuming that is not part of the issue.

Noah_SUMO,
Regarding Naomi Internet Filter, I verified that it was -not- something installed (I hadn't heard of it before, but I made sure nevertheless in case it piggybacked on something).
As far as system restore software, I keep none =x
Never have, and I change over OS's relatively often (I went from 7 this past fall to 7/Kubuntu/BTLinux, to 8DeveloperPreview/Kubuntu/BTLinux, to overwriting Kubuntu with 7 a few weeks later, overwrote 8DevPrev to 8ConsumerPreview, and then removed both linux partitions and remerged with a fresh install of two separate partitions for 7 and 8 (I help with some OS compatibility/stress testing for a friend's software development company).
As far as software that monitors or interacts with online connections..
Adobe Flash Player 11 Plugin, Apple Application Support, Apple Software Update, Bonjour, Google Chrome (not that it's preferred over FF, just over IE ;]), Java(TM) 7 Update 3, Microsoft Security Essentials, Microsoft Silverlight (I started having issues not long after I installed Silverlight, however I don't feel like this is causing any issue, as I tried removing it and reinstalling everything from scratch, but no luck), Mozilla Firefox 11.0 (x86 en-US)/Mozilla Firefox 12.0 (x86 en-US), Mozilla Maintenance Service, No-IP DUC (tested this and found no difference or ability for it to hinder FF), (previously) Skype 5.8, TortoiseSVN 1.7.5.22551 (32 bit), and WinSCP 4.3.7.
None of which I've found to have issues with Firefox in the past, as well as FF was working with them until just recently.
As far as I can tell, automatic updates were disabled for everything (including my OS), and no changes had been made to any of the software, with the exception of I had installed Silverlight, but as mentioned earlier, I didn't find any issues with this.
Like you say, my best guess at this point would be that there's something funky set up with my partitions, and so I may just do another fresh wipe and try again (it just takes forever to get everything installed that I need for school, so I'll probably just wait it out for a while).
The only reason in which I would go against it being a partition setup issue, is that it -was- working. However, I do recognize that something could have come up after a while (not sure how, but I don't doubt it).
I hadn't thought about downgrading past 11, but it's definitely worth a shot, and I'm more than willing to try. once I'm done with stuff today I'll give it a shot and post the results here.
Thanks so much for your suggestions.

Firefox 4.0 will not install. I have Mac OSX 10.4.11. Error message 10661.

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Firefox 4 doesn't run on a PowerPC Mac.
Firefox 4 requires at least OS X 10.5 and an Intel Mac.
* http://www.mozilla.com/firefox/4.0/system-requirements/
For Mac OS X 10.4.11 or Mac OS X 10.5.8 you can look at:
* http://www.floodgap.com/software/tenfourfox/
Firefox 3.6.x can be found here:
* http://www.mozilla.com/en-US/firefox/all-older.html

I downloaded Firefox Optimized for Yahoo on my PC and get an error message about every 15 seconds: Java Script/ Uninstall set. I deleted Firefox and did a new download/installation and am getting the same problem.

:I went to Mozilla's website and downloaded the Firefox Optimized for Yahoo, following the directions. The download installed easily, but when it opened my Yahoo web page (I already had an account with them), the Java Script error message "Uninstall set!" immediately began alerts, and kept repeating the alert about every 15 seconds. I got the same result even after uninstalling Firefox and downloading a fresh installation. I am only getting this alert via Firefox; I do not get it when using my Yahoo page with Google. Thanks.

See:
* https://support.mozilla.com/kb/Firefox+is+already+running+but+is+not+responding

After 8.0.1, Firefox continually asks to reboot, I reboot, and get same error message. No Firefox.

Upgraded to 8.0.1. A "Setup" error box drops down: "Your computer must be restarted to complete a previous upgrade of Firefox. Do you want to reboot now?" I reboot multiple times, and the box still appears. Went back to an earlier restore point in XP to delete the upgrade. It is still there. Tried to download the new version in IE, and will not allow it to go to the internet. I would like to use Firefox, but now only use IE, and cannot access my bookmarks, or any other programs.

The file is located inside the Firefox installation folder '''Mozilla Firefox'''. This folder would usually be inside the '''Program Files''' folder if Firefox was installed with the default options. If so you can browse to this folder - '''Program Files''' could be on any drive in '''My Computer''' but usually in the '''C''' drive. Alternatively you can type '''%programfiles%''' in the '''start''' menu '''Run...''' box and hit '''OK''' and look for the Mozilla Firefox folder, go inside it and delete the ''updates.xml'' file.
If the '''Mozilla Firefox''' folder is not located in Program Files, you can search for '''Mozilla Firefox''' from the '''start''' menu '''Search''', choose '''All files and folders''' on the left, type '''Mozilla Firefox''' on the top left box and click '''Search'''. When the results appear, double-click on the said folder and delete the file if present.
Useful links:
[https://support.mozilla.com/en-US/kb/Options%20window All about Tools > Options]
[http://kb.mozillazine.org/About:config Going beyond Tools > Options - about:config]
[http://kb.mozillazine.org/About:config_entries about:config Entries]
[https://addons.mozilla.org/en-US/firefox/addon/whats-that-preference/ What's That Preference? add-on] - Quickly decode about:config entries - After installation, go inside about:config, right-click any preference, enable (tick) MozillaZine Results to Panel and again right-click a pref and choose MozillaZine Reference to begin with.
[https://support.mozilla.com/en-US/kb/Keyboard%20shortcuts Keyboard Shortcuts]
[https://support.mozilla.com/en-US/kb/Safe%20Mode Safe Mode]
[http://kb.mozillazine.org/Problematic_extensions Problematic Extensions/Add-ons]
[https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes Troubleshooting Extensions and Themes]

I am running Firefox 3.6.3 I attempted to upgrade to 3.6.13 and am unsuccessful. Error message is somehthing like "unknwon web site".

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