Firefox 3.6.x is not opening websites properly

Hello,
I am using Firefox from 3 years now, but never had this problem with earlier versions. When I open websites that are using Ajax or websites like facebook, youtube etc, Firefox keep on working and does not open websites. I have installed Google Chrome it is working fine. Another issue is that version 3.6 is very very slow in loading and eat lot of memory. I don't know if anyone of you have experienced this, but after installing and using IE and chrome I am sure it is not my internet connection.

Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). 
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]] 
 
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. 
You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions. 
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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I have used Firefox on my computer for several years. Today, after upgrading to the new version, I was not able to open Firefox. I have tried several times uninstalling and re-downloading Firefox. It still will not open! What is wrong?

I have used Firefox on my computer for several years. Today, after upgrading to the new version, I was not able to open Firefox. I have tried several times uninstalling and re-downloading Firefox. It still will not open! Is the new version not compatible with Windows Vista?

I hope that link points to mozilla.com or mozilla.org
You will have to close firefox.exe with the Windows Task Manager from the "Processes" tab of the WTM since you don't have a widow to close.
The best way to close Firefox is through File > Exit, for those who stuck with the "Firefox" button click on the Firefox button then Exit. It is not perfect but it is a lot better than just closing the window with the "X" in the upper right corner

I updated Firefox and now it will not open at all. The hourglass shows that it's working but then nothing. I went to add/remove and removed mozilla and reinstalled it and still the same thing. It worked fine before I updated.

I updated Firefox and now it will not open at all. The hourglass shows that it's working but then nothing. I went to add/remove and removed mozilla and reinstalled it and still the same thing. It worked fine before I updated. Now I can't even remove the program at all. Why is this happening?

Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
Create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.com/kb/Basic+Troubleshooting#w_8-make-a-new-profile
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.
If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

When I try to install Firefox, I get a "can not open output file" error. I was using Firefox before and it stopped working, so I uninstalled. Cannot re-install now.

When I try to install Firefox, I get a "can not open output file" error. I was using Firefox before and it stopped working, so I uninstalled. Cannot re-install now.
== This happened ==
Every time Firefox opened
== I tried to download firefox. ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; AntivirXP08; GTB6.3; .NET CLR 2.0.50727; MS-RTC LM 8)

When you click the download link on [http://getfirefox.com GetFirefox.com], you should be asked if you wish to Run or Save the file. If the described situation happens when trying to Run the download, try instead to Save it and put the file on your Desktop or a similar place where you are certain that you can find it again.
When the download is complete, try double-clicking the downloaded file in the normal Windows Explorer (browse your way to the file from My Computer). This should start the installation.
If you notice in the Explorer window that the file seems to be lacking the Firefox orange/blue icon, rightclick the file and select Properties. The picture should look somewhat like the attached picture (except that mine's in danish, but that is irrelevant) if saved correctly - if it does NOT look like this, please describe the contents or attach a screenshot of the box. Especially what it says under "File type" - it should be "Program"; if it's not, we'll have to look into what the problem could be here.
Slightly off-topic, your Internet Explorer seems to be quite a bit out of date (IE 6, where current version is IE 8), so I would strongly recommend that you try to run Windows Update to get your system updated. If this is a company system (like a Terminal Server thin client machine), this may not be possible, and your system administrator will most likely have to help you.

After installing updated firefox,my speed dial will not open when I close the current tab which it did before I upgraded

after installing updated firefox,my speed dial will not open when I close the current tab which it did before I upgraded. How do I fix this problem? Thank You, Mike Chidester

is it up to date
Speed Dial :: Add-ons for Firefox
"Works with:
Mobile 0.7 - 1.0.*
SeaMonkey 2.0 - 2.5a1
Firefox 2.0 - 8.0a1"
https://addons.mozilla.org/firefox/addon/speed-dial/#detail-relnotes

I am running windows 7. We updated firefox and it would no longer open. I uninstalled it and reinstalled from firefox website. I click on the firefox icon and it will not open. Help please

It installs and I attempted to launch the browser and it never starts. I tried to uninstall, but it says firefox is running. I restart my computer and uninstall and try again. It still will not open after install is complete. Why won't it ever open up? Help please!

Right-click on your Windows Taskbar and select Start Task Manager. Look in Task Manager for processes running that are Firefox-related, such as Firefox.exe or plugin-container.exe. If you see either of those, right-click each of them and select "End process". Then try again to start Firefox in [[Safe Mode]]. 
*If Firefox will start in Safe Mode, select the option you are presented with to disable your add-ons and plug-ins and restart Firefox normally. You likely have a plug-in, add-on, or a combination of two or more that is causing the problem. Because Firefox allows users to customize endlessly, sometimes there can be conflicts between customized items. From the Firefox menu bar, go to Tools -> Add-ons then re-enable them one by one, restarting Firefox after each and testing after each one to see which one or combination of two or more is causing the problem. 
*If Firefox will not start in Safe Mode, make sure you again check Task Manager and end any running instances, then uninstall Firefox and download a fresh copy from mozilla.org/firefox using another browser temporarily. Re-install Firefox (see: [[Installing Firefox on Windows]] for more help ) and try running Firefox again.
Please report back your progress.

I have downloaded the new Firefox 4 but it will not open and i have tried to uninstall and reinstall the new version.

I have tried 8 to 10 times to uninstall and reinstall Firefox 4. I have since checked my firewall settings and firefox is allowed. It simply just will not open for me. I previously have had firefox and it was simply an update from the 3.6 version. I have websites i need to used saved under my bookmarks and cannot access them in internet explorer

Check out this thread: Downloaded Lightroom CC but only get a quick flash of the startup screen then nothing, Lightroom 5 still working.

I can not open websites with .php in web address.

I simply can not open any website that has a .php in it's address. it tells me to select a program to open it.

Do you have trouble with these examples: (really same page)
* http://kb.mozillazine.org/index.php?title=Bookmarking_methods
* http://kb.mozillazine.org/Bookmarking_methods
I've looked at Control panel and not mentioned in mine
:Control Panel\All Control Panel Items\Default Programs\Set Associations
I've looked in Firefox Tools > Options > Applications
:and not mentioned in mine, but you might try adding
See https://support.mozilla.com/en-US/questions/748137
(I would rename rather than delete a file in profile, which would be the last thing I'd try, mainly because I'm curious if the third response has anything to do with the problem, which I don't have, but which would fix something else like being able to view javascript alert and message with readable color and formatting)

I can not open website

I can not open a website that associated with google adsense. For example http://www.tekno-online.com

I tried both and they loaded without any problem.
Many site issues can be caused by corrupt cookies or cache.
* Clear the Cache and
* Remove Cookies '''''Warning ! ! '' This will log you out of sites you're logged in to.'''
Type '''about:preferences'''<Enter> in the address bar.
* '''Cookies;''' Select '''Privacy.''' Under '''History,''' select Firefox will '''Use Custom Settings.''' Press the button on the right side called '''Show Cookies.''' Use the search bar to look for the site. Note; There may be more than one entry. Remove '''All''' of them.
* '''Cache;''' Select '''Advanced > Network.''' Across from '''Cached Web Content,''' Press '''Clear Now.'''
If there is still a problem,
'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link}
While you are in safe mode;
Type '''about:preferences'''<Enter> in the address bar
Select '''Advanced > General.'''
Look for and turn off '''Use Hardware Acceleration'''.
Poke around safe web sites. Are there any problems?
Then restart.

I have uninstalled and reinstalled and Firefox for windows 7 will not open. There is no error message--it just doesn't open, even in safe mode. What do I do?

My computer is set to auto update for Windows 7 Home Premium and for Microsoft Office Professional Plus 2010. I am also running Norton 360. There was a major update for Office on 12/10/14 that seems to be when my problems started. This month, every time my updates have caused a reboot, Mozilla has failed to open. I have uninstalled it and reinstalled it several times, and it has only lasted a day or two before it crashes again. This last time it will still not open. All the instructions to troubleshoot seem to be based on the idea that the program is open and just has issues. I can't even get it to open up in Safe Mode.
I have tried to reinstall, and it says that it will launch automatically when the install is complete, but it is not working. Since Norton scans every download before it runs, I'm not certain if that is where the problem is since I never get the window that shows the step by step installer for Firefox.
What do I need to do?

Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. A clean reinstall is not the same as a regular reinstall performed using the built in installer. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from [https://www.mozilla.org mozilla.org] (or choose the download for your operating system and language from [https://www.mozilla.org/firefox/all/ this page]) and save the setup file to your computer.
#After the download finishes, close all Firefox windows (or open the Firefox menu [[Image:New Fx Menu]] and click the close button [[Image:Close 29]]).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found [[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox|here]].
WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your [[Profiles|Firefox profile]] data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See [[Back up and restore information in Firefox profiles]]. 
Please report back to say if this helped you!
Thank you.

I installed the new Firefox version but it does not open on screen..

It does not automatically open on completion of the install and it does not open when I click on the logo on my desktop or Quick Start bar. It looks like it is starting but nothing happens.
I have tried uninstalling and reinstalling with the same result.
When I try to uninstall I have to shut down first or the uninstall tells me firefox is running. Starter manager does not show this.

Why not? What happens when trying to use it?
"Will not work" is useless when asking for help. Without specifics, no assistance can be provided.

I've just updated firefox and now it will not open at all. Please help!

I use gmail and a couple of days ago I started having trouble accessing it and in fact any google related site. Apparently my version of firefox was not supported so I updated to the current version this morning but then found that firefox would not open at all. There are no error messages. I have tried restoring my settings to those of yesterday but although my system says I have returned to the old version 3.5.15 it still will not open. I can now only access the internet by using an ancient version of Microsoft Internet Explorer - which is also not supported by gmail. Although I'm limping on I could really do with some help!!

Perhaps give one of the following documents a try:
iTunes for Windows Vista or Windows 7: Troubleshooting unexpected quits, freezes, or launch issues
iTunes for Windows XP: Troubleshooting unexpected quits, freezes, or launch issues

I have tried everything that has been suggested and even deleted and downloaded Firefox again and it will not open. Any ideas on how to get it to open?

I have been trying to get Firefox to open up and everytime I double click on the icon nothing happens. I have gone to the task manager and deleted it from the process list and tried again and still will not open. I have even tried deleting the program and downloading it again and it still will not open.

What was the full wording of the error message? Usually there is also a number or additional information.
Try placing the iPod in Recovery Mode and then restore
Next try DFU mode and restore.
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings

Safari will not open websites saying can't find website

Safari will not open some websites saying can't findserver. It will open others like them. Will JavaScript cause this issue. How do I fix my safari and get my websites to open.

Please post the links for the sites you can't open in your Reply please.

Firefox suddenly crashed and will not open

I am having this problem as well. I believe I have the latest version of FF. It was working fine all day then all of a sudden just crashed and will not open. I first kept getting a window stating"
"Firefox had a problem and crashed. We'll try to restore your tabs and windows when it restarts"
I submitted the crash report all 3 times it crashed successfully. But now, Firefox will not open at all,not even in safe mode.
I have looked through any suggestions and nothing works. I can't even get the profile manager to open to test it.
I would like to roll back to a previous version, IF that will solve this problem,but it's my bookmarks that I want to save. I don't want to lose them. But how can I import them if I can't even get FF to start?
I did see a folder called bookmark backups or something, but for some reason it isn't showing all of them.
Also, I was in a live chat with someone trying to help but they just left :( I was able to see my crash report via the instructions on this site, but now what? What do I do with it?
Please can someone help me?
== Crash ID(s) ==
Crash ID: bp-0e13ebf8-31f7-4c8c-af10-a71212100629 ; Crash ID: bp-045b2c26-cdf2-4cae-9515-af4ee2100629 ; Crash ID: bp-b4b9d0ed-913b-4d0b-a7e9-f85c82100629
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30618; .NET CLR 1.1.4322)

See http://kb.mozillazine.org/Browser_will_not_start_up
*http://kb.mozillazine.org/Firefox_crashes
*https://support.mozilla.org/kb/Firefox+crashes

Firefox 3.6.x is not opening websites properly

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