I want to go back to old firefox, will my bookmarks be ok if I dump firefox 4 and reload firefox 3.?

I am having problems with the new version not wanting to open PDF and other web pages, I just want my old version back but dont want to lose my bookmarks if I unload 4 and then put 3 back on

Go to [http://www.mozilla.com/en-US/firefox/all-older.html Download Firefox v3.6.17] and download it to the desktop. 
Then go to Add/Remove Programs, scroll down to "Mozilla Firefox" and remove it, choosing to keep your bookmarks, customizations etc., (don't checkmark the box). 
Then reboot and delete the folder called "Mozilla Firefox" at this location: C:\Program Files\Mozilla Firefox 
Finally run the installation file you downloaded to the desktop earlier. 
Your bookmarks, customizations etc., are maintained in a different location and will become available to you again once you complete the installation.

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Hi, I am running windows 7 and currently firefox 3.6.... When i download and install firefox 4 or 5 it appears to be successfull but when i try open it, nothing appears to happen, although there is no error message. Any ideas?

Hi, I am running windows 7 and currently firefox 3.6.... When i download and install firefox 4 or 5 it appears to be successfull but when i try open it, nothing appears to happen, although there is no error message. Any ideas?

Hi, I am running windows 7 and currently firefox 3.6.... When i download and install firefox 4 or 5 it appears to be successfull but when i try open it, nothing appears to happen, although there is no error message. Any ideas?

I cannot print out a webpage when viewed with firefox. I've removed and reloaded firefox. Same issue.

I cannot print out a webpage when viewed with firefox. I've removed and reloaded firefox. Same issue. Printer program drop down indicates printer is offline. I bring up the same page with IE and no problem. Prints out no problem.

Try the '''''reset''''' described here: 
http://kb.mozillazine.org/Problems_printing_web_pages#Reset_printer

If I download a new version of Firefox and delete the old one, will my bookmarks be saved? Should I simply put the old version in the trash?

I just downloaded Firefox 31 and would like to get rid of the old version without losing my bookmarks.

Hello jlinder, YES your bookmarks will be saved.
1. Download full installer from http://www.mozilla.org/en-US/firefox/all/
2. '''Trash''' the current Firefox application to do a clean install.
3. Install the version that you have downloaded.
Do not select to remove your personal data, your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox#Mac Firefox Profile Folder], so you won't lose your bookmarks or other personal data.
see also: [https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac?redirectlocale=en-US&redirectslug=install-firefox-mac#os=mac&browser=fx24 Installing Firefox on Mac]
thank you

Firefox will not open. I have tried re-installing and deleting my profile and nothing has worked.

I tried to download an extension for Firefox and after that it just stopped working, no response. I have tried re-installing the browser, deleting files & profiles. Nothing has worked. I cannot access the profile manager either *sad face*

Hello,
Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. 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 http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#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
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#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 [https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems?esab=a&s=troubleshooting&r=3&as=s#w_5-reinstall-firefox here].
WARNING: Do not run Firefox's uninstaller or use a third party remover as part of this process, because that could permanently delete your Firefox data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be recovered unless they have been backed up to an external device!
Please report back to see if this helped you!
Thank you.

Firefox will not let me get on any websites (safe AND not safe), claiming that it "may pose a security threat to your system"; when I try to choose the "proceed unprotected" option, it won't let me.

My computer's anti-virus software recently expired. A few days later, I went to download a new anti-virus software . . . when I opened up Firefox, I received a warning that claimed Firefox was infected with "Trojan-BNK.Win32.Keylogger.gen", and gave me two options: "Activate XP Security 2011 (recommended)" (this was a $60 charge and required credit card info) or "Continue unprotected (Dangerous)"
Since I needed to install new anti-virus, I figured I would continue unprotected, download my new software quickly, and remove the virus. But when Firefox opened, it gave me a message saying: "Firefox alert. Visiting this site may pose a security threat to your system!". Gave me three options:
1. "Get a copy of 'XP Security 2011' to safeguard your PC while surfing the web (RECOMMENDED)"
2. "Run a spyware, virus and malware scan" (I already did this)
3. "Continue surfing without any security measures (DANGEROUS)"
I tried clicking on different links, but the same warning kept showing up, even on verified and safe sites. I tried to choose the third option so that I could download my anti-virus software quickly, but nothing happened when I clicked on it - the page reloads and the warning shows up again.
My computer is still without anti-virus software because Firefox will not let me surf the internet. Please help!

It sounds as though your PC is infected with fake antivirus software. The detailed cleanup instructions vary depending on which fake AV you have. However, as a first step, try this:
Download the following on a different PC, copy them to a USB flash drive or CD, and then run them on the infected PC:
Malwarebytes Anti-malware : http://www.malwarebytes.org/mbam.php
SUPERAntiSpyware : http://www.superantispyware.com/
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The option "Show my windows and tabs from last time" no longer works and reloading Firefox does not fix it.

I have been using this for as long as the feature has been available along with App tabs. All of a sudden it no longer works. I have tried resetting the option to something else and then back again. I've also tried reloading and reinstalling Firefox. Neither of these worked. I can't see any other anomalies. It seems to be working fine otherwise. I use Windows 7.

Hello Carla5, '''UNCHECK the "Warn me when closing multiple tabs"''', go from Firefox button > Options to access the options window > Tabs panel > Uncheck '''Warn me when closing multiple tabs''' [ ] , click OK to save it, exit firefox and restart it.
[https://support.mozilla.org/en-US/kb/tab-preferences-and-settings#os=win7&browser=fx19 Tab preferences and settings]
thank you

How to install Firefox for Mac on an external USB 3.0 drive and run Firefox portable?

I recently acquired a new MacBook Pro 10.9 Mavericks laptop and, I would like to to install Firefox for Mac on a Mac-compatible external USB 3.0 HD, and import my 16MB of legacy bookmarks from a PC-compatible USB 2.0 HD and, run Firefox as a portable application, as I did for years on my 7-year-old EOS'd Dell Inspiron XP laptop.
Do-able?
If so, I would like to do the same with Thunderbird...

Hi,
There are portable versions of Firefox and Thunderbird but Mozilla doesn't offer them directly. You can get them from PA.com. Links are below:
*[http://portableapps.com/apps/internet/firefox_portable Firefox 28.0]
*[http://portableapps.com/apps/internet/thunderbird_portable Thunderbird 24.4.0]
All you have to do is open it, and point the installation directory to your USB Stick

Firefox will not load, have uninstalled, reinstalled, stuck with explorer and unhappy.

After updating, firefox stopped loading. Have tried nummerous uninstall, reinstallation. But still after double-clicking the firefox icon (or opening in any way), the computer thinks about for a sec and then...nothing happens. I have opened up task manager and closed the adnousium of firefox.exe's that pile up after double-clicking.

Hi Johnynutz, First of all try to check that security software is not blocking Firefox. A new version may not be recognised, and in these circumstances before attempting to start Firefox always check in Task Manager that no instance of Firefox.exe or plugincontainer is left running.
Next It is probably worth seeing if you can open the Firefox profile manager, if so you may create a new profile for Firefox and try to restart it with that new profile. Standard reinstalls do not remove the profile (do NOT attempt profile removal unless you have backed it up)
* see [[Use the Profile Manager to create and remove Firefox profiles#w_creating-a-profile]]_creating-a-profile
If that fails then it is necessary to re-install firefox, and this time use a clean re-install. Note it is the program files that are being removed NOT the profile files. Do not use any option from Windows or Firefox that removes personal information, because that will destroy bookmarks and passwords etc.
* see [[Troubleshoot and diagnose Firefox problems#w_7-reinstall-firefox]]_7-reinstall-firefox
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Please post back with how you get on.

I have Google now and I hate it. If I download Firefox will I be able to access my gmail account and have the google access to my friends

locking as a duplicate of https://support.mozilla.org/en-US/questions/1054272''
If I download firefox will I be able to access my gmail account.

Export Photos and Videos from Camera Roll to your computer.
Empty Camera Roll.
Make a Folder/Album with all photos and videos you want to have in your iPhone and sync them through iTunes.
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Firefox does not work any more and every time I attempt to access it (even in Safe Mode) it displays the following message:
Firefox.exe- Entry Point Not Found
The procedure entry point JS_GetOperationLimit could not be located in the dynamic link library js3250.dll.
I have absolutely no way of getting into Firefox to undo whatever has gone wrong, is it still possible to solve this without having to completely purge and reinstall Firefox?
== This happened ==
Every time Firefox opened
== I clicked on something else during the installation of an update and Firefox has failed to start ever since ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6.5; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

Thanks kenton. But now pop-up says beta 5.
The ''real issue'' is what is going on. On one machine the update process works, but on my other machine it does not.
The machines are identical IBM T60s with Windows XP.
This is a real mystery, as well as being annoying.
A clue or suggestion any one?

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I added adblock, that seemed to work OK. The same day I was tracking down slow download speeds with my ISP and they had me go to, I think...I can't remember to well, the tools menu and erase cookies, passwords, etc. I don't remember what else was erased,
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Uninstalling and reinstalling Firefox doesn't usually solve anything, because most problems are contained in the profile.
* [[Reset Firefox – easily fix most problems]]
Based on the value of the ''keyword.URL'' preference, it looks like your system is either infected with malware, or was at some point in the past. You also seem to have a user JS file, which could prevent you from modifying certain preferences.
* [http://malwaretips.com/blogs/www-search-net-removal/ Remove “www-search.net” | Malware Tips]
* [[Troubleshoot Firefox issues caused by malware]]

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Apple has removed support for the Java Plugin2 with the latest Java Update 10 for OS X 10.5 Java version, so the Java plugin is no longer available for Firefox versions and other browsers like Google Chrome that require the Java Plugin2.
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There will be fix for this in the next release (Firefox 5.0.1 or 6), so that Firefox will find the plugin again.
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Firefox will not open.ie works just fine. how do I get firefox working again?

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See also:
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating

I want to go back to old firefox, will my bookmarks be ok if I dump firefox 4 and reload firefox 3.?

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