I can no longer open multiple tabs in a window but if a program opens another tab it will work but clicking on "new tab" does not work.

That is the details. When I click on "new tab" it will not open a new tab in the current window. When I click on something that will open a new tab it works that way. I can open new windows, that is not problem This only happened the last week or so.

This issue can be caused by the Ask.com toolbar (Tools > Add-ons > Extensions)
Your system details show that toolbar in the user agent as AskTbEPC/3.13.1.18107
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

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Firefox previously worked fine but after installing new version does not open. Opens in the same day that I install it but not after restarting computer.

I just installed the new version of firefox. My firefox worked fine with the previous version. But the new version only works on the day I install it but the next time i start my computer it does not work. It does not open after clicking the icon. I even uninstalled it and then reinstalled it but again the same thing happened. I have no idea about plug ins etc. but I did not install any new ones.

This is a very interesting issue. Let's start with trying [[safe mode]], [[managing profiles|new profile]], and [http://firefox.com/all-older.html installing an older version] - if one of these works, please don't do the rest and reply here.

"Warn me when closing multiple tabs" does not work on Mac Version 5.0.1

The "question" says it all. Even though this box is checked in FireFox Preferences, it doesn't work on my iMac. The browser closes immediately. There is no pop-up with a question.

You can set the warn prefs on the about:config page to true via the right-click context menu or toggle the value with a double left-click.
* browser.showQuitWarning, see http://blog.zpao.com/post/3174360617/about-that-quit-dialog
* browser.tabs.warnOnClose, see http://kb.mozillazine.org/About%3Aconfig_entries
* browser.warnOnQuit , see http://kb.mozillazine.org/browser.warnOnQuit
* browser.warnOnRestart , see http://kb.mozillazine.org/browser.warnOnRestart
To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website. 
If you see a warning then you can confirm that you want to access that page. 
*Use the Filter bar at to top of the about:config page to locate a preference more easily.
*Preferences that have been modified show as bold(user set).
*Preferences can be reset to the default or changed via the right-click context menu.

Suddenly I can open only one Firefox window at a time. I can have multiple tabs in that window, but I can suddenly no longer open another window. What happened?

Suddenly I can open only one Firefox window at a time. I can have multiple tabs in that window, but I can suddenly no longer open another window. What happened?

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.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

All of a sudden I can no longer open new tabs.

I have been using Firefox for a long time with no problems. Today for the first time I can no longer open new tabs. I reloaded the program with the same results.

Disable or un-install the Ask Toolbar. There is a compatibility issue with the Ask Toolbar in Firefox 3.6.13 that Ask needs to fix:
*http://support.mozilla.com/en-US/kb/Uninstalling%20add-ons#w_how-to-disable-extensions-and-plugins
*http://support.mozilla.com/en-US/kb/Cannot%20uninstall%20an%20add-on
 
'''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. You can also see your plugins from the Firefox menu, Tools > Add-ons > Plugins.
*Adobe PDF Plug-In For Firefox and Netscape "9.4.2"
**There is a new version of Adobe Reader available (version 10 or Reader X) that you may want to look into
**Your current version 9.4.2 is the most recent for Adobe Reader 9
**About Adobe Reader X (version 10)
***New Adobe Reader X (version 10) with Protected Mode was released 2010-11-19
***See: http://www.securityweek.com/adobe-releases-acrobat-reader-x-protected-mode
***If you want to update to Reader X, follow the instructions below
*Shockwave Flash 10.1 r102
**'''''Security update released 2011-02-08'''''
*Next Generation Java Plug-in 1.6.0_22 for Mozilla browsers
**1 update behind; version 1.6.0_23 is a stability update according to Sun/Java
#'''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, SAVE it to your hard drive, when complete, close Firefox, click on the installer you just downloaded and let it install.
#***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'''.
#**http://kb2.adobe.com/cps/191/tn_19166.html#main_ManualInstaller
#**Note separate links for:
#***Plugin for Firefox and most other browsers
#***ActiveX for IE
#'''Update the [[Java]] plugin''' to the latest version.
#*Download site: http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)
#*Also see "Manual Update" in this article to update from the Java Control Panel in Windows Control Panel: 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

All of a sudden I can no longer open tabs by clicking "+" or right clicking on the tool bar. To open a new page, I have to open a whole newFirefox window. How can I fix this?

All of a sudden I can no longer open tabs by clicking "+" or right clicking on the tool bar. To open a new page, I have to open a whole new Firefox window. How can I fix this?
Also, Firefox crashes frequently. Is there a fix for this also?

Uninstall the Ask toolbar and it should work again. There is a compatibility issue with the Ask toolbar and Firefox 3.6 that prevents new tabs from being opened.
There are a couple of places to check for the Ask toolbar:
* Check the Windows Control panel for the Ask Toolbar - http://about.ask.com/apn/toolbar/docs/default/faq/en/ff/index.html#na4
* Also check your list of extensions, you may be able to uninstall it from there - https://support.mozilla.com/kb/Uninstalling+add-ons
For the second issue, the [[Firefox crashes]] support article may help.

All of a sudden I can no longer open a new tab using either the icon on the tab bar, the keyboard short cut or the File menu option. I can open a new tab ONLY by clicking on a bookmark or link.

All of a sudden I can no longer open a new tab using either the icon on the tab bar, the keyboard short cut or the File menu option. I can open a new tab ONLY by clicking on a bookmark or link

This issue can be caused by the Ask.com toolbar (Tools > Add-ons > Extensions)
Your system details show that toolbar in the user agent as AskTbAD2/3.12.2.16749
* https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Can no longer open two Firefox tabs, have close using Task Bar/Processes. Some links won't activate on websites. As per support suggestion,have backed up profile, deleted existing profile, removed firefox and replaced thingsetc

Can no longer open two Firefox tabs at the same time. Will disappear from screen but won't close - have to go to Task Bar/ Processes to close it, some links won't activate on websites. As suggested in the support area I have gone through the process of backing up my profile, deleted existing profile, removed firefox from computer, reinstalled profile in fresh folder, reinstalled firefox 6. I have done this twice for no effect - may work as it used to for a while (30mins) then gets back to its old tricks.
It is a bit irritating.

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
Did this fix your problems? Please report back to us!

Ever since I updated to Firefox 4.0, I can no longer open links in a new tab by holding ctrl and clicking the link. Any help?

Ever since I updated to Firefox 4.0, I can no longer open links in a new tab by holding ctrl and clicking the link. The only way I can open a link in a new tab is if I right click a link and select "open in a new tab" in the dropdown menu, but ctrl + click is so much easier and faster. Any clue how to fix this?

Some other users have fingered the Ask toolbar as the cause of this problem. You can try disabling or removing it here:
orange Firefox button ''or'' Tools menu > Add-ons > Extensions
Does that help?

I can no longer open new tabs, either by clicking on the icon or hitting control T. I have tried reinstalling.

I can no longer open new tabs, either by clicking on the plus sign or by hitting control T. I tried re-installing, but it didn't help.

Try uninstalling the Ask toolbar and it should work again. There is a compatibility issue with the Ask toolbar and the current version of Firefox.

I can no longer open tabs while in Mozilla Firefox. It only opens my default site.

I keep losing internet connection via IE. I have been using Mozilla Firefox and, I am now starting to drop internet connection via Firefox. I've had my router checked and that is not the problem. When I do connect and see my default page, I can no longer access additional tabs to go to other sites. Please advise.
Eileen

Disabling is not enough, you need to uninstall the toolbar.
Check the Windows Control panel for the Ask Toolbar - http://about.ask.com/apn/toolbar/docs/default/faq/en/ff/index.html#na4
Also check your list of extensions, you may be able to uninstall it from there - https://support.mozilla.com/kb/Uninstalling+add-ons

My Firefox can no longer open new tabs. I click the icon but it does not work. How can I fix this?

The "+" icon that opens new tabs does not open a tab.

With Firefox version 4 and 5, the default setting is ''not'' to ask the question for saving the session. You can get back that behavior by modifying the options as below: 
# In the address bar, type '''about:config''' and press Enter.
# Accept the warning message that appears, you will be taken to a list of options.
# In the '''Filter''' textbox at the top, type '''browser.tabs.warnOnClose'''
# You will be presented with the entry for '''browser.tabs.warnOnClose'''. If its value is set to '''false''', double-click on it to change its value to '''true'''.
# Repeat these steps for options''' browser.warnOnQuit''', '''browser.warnOnRestart''' and '''browser.showQuitWarning''' and set their values to '''true'''.

I can no longer see my tabs on my browser. I have checked the settings and have it set to show them but I still do not see them anywhere. Help plz?

When I have numerous tabs open I used to be able to see them along my browser border. My daughter pounded on my keyboard and now I can no longer see my tabs but I know they are there because when I go to close the browser it warns me that I'm closing multiple tabs. Anyone know any tricks to make them reappear?

Try to delete the localstore.rdf file in the Firefox Profile Folder.
*http://kb.mozillazine.org/Corrupt_localstore.rdf
Start Firefox in [[Safe Mode]] to check if one of the extensions (or 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.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

After my OS update I can no longer open email attachments. What could be the issue??

After my latest OS update I can no longer open email attachments. What might be in the issue??

Quit Mail and restart.
Select each of your mailboxes and select Rebuild under the Mailboxes menu.
If those don't help, then reinstall Yosemite:
Reinstall Lion, Mountain Lion, Mavericks or Yosemite without erasing drive
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu.
Reinstall Lion, Mountain Lion, Mavericks, or Yosemite
OS X Yosemite- Reinstall OS X
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it is three times faster than wireless.

I have several very important school related documents on my iPad in the Pages app. Ever since i updated to iOS5, i can no longer open any documents in Pages that I made before I updated. Please help

I have several very important school related documents on my iPad in the Pages app. Ever since i updated to iOS5, i can no longer open any documents in Pages that I made before I updated. Please help

Without the iPad connected, open up iTunes on your computer. Go to iTunes/Preferences/Devices and delete the backups that you're absolutely certain do not have the documents. Refer to figure below.
iTunes, select the iPad and then select the Summary tab. Follow directions for Restore and be sure to say "NO" to creating a backup. (You don't want to create a new backup that does not have the docs.) You will then be warned that all data (apps, music, movies, etc.) will be erased but, as the Restore finishes, you will be asked if you wish the contents of the backup to be copied to the iPad. This time, say "yes."
Repeat all of the above as required until you get the docs.

Acrobat DC can no longer check multiple comments

You guys, I am feeling kind of sad because I can no longer check multiple comments at once.
In the last version of Acrobat Pro I could select more than one comment and then check one of the selected check boxes and all selected comments would be marked checked. This saved me time when I was working through a couple of hundred corrections in a PDF and wanted to keep track of the ones I'd done.
I'm not sure why this feature would now be disabled in Acrobat DC but I hope Adobe bring it back soon.
Then again maybe there is a way to do it - anybody else worked this one out?

actually there is a way to do it. You have to select the last comment on the list and then press the shift key and check the comment. This will mark off all the comments. This works okay with a document with say 100 comments, but if your document has over 1,000 comments then this is very much hit and miss. In that case you are better off opening the same file in Adobe Reader XI providing you didn't update that.
Abother more irritating bug is the fact that if a word is highlighted then the words are hidden until you actually select the wordAAl
All in all, Acrobat DC isn't ready for production purposes. I wasted many hours trying to use it until I realised that I could still use Adobe Reader XI.

I can no longer open multiple tabs in a window but if a program opens another tab it will work but clicking on "new tab" does not work.

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