Firefox always opens 2nd tab for Yahoo sign in

I had to reset Firefox to try to fix another software issue (which it didn't fix btw) and after the reset every time I open Firefox I get a 2nd tab for Yahoo asking me to log in to my Yahoo account even though I never sign out. I check the Keep me signed in box, enter my password and click sign in and then the next time I open Firefox I have to go through the process all over again because the Yahoo tab opens up AGAIN! I'm using the Yahoo Mail Notifier extension for Firefox but I've used it for years with no problems. I saw somewhere else that someone suggested going into the Options and the Privacy tab and under History making sure it was set to Use Custom Settings for History and that Use Private Browsing Mode was NOT checked and that Keep Cookies was set to Keep Until Firefox Closed with an exception for Yahoo. But mine was set to Remember History. However, when I set it to Use Custom the Private Browsing Mode wasn't checked, the cookies are set to Keep Until they Expire and there's a box to Clear History when Firefox Closes and it's NOT checked. Does anyone have any suggestions for what might be causing this? It's really frustrating!

Thanks, that was the culprit unfortunately. I really loved that button :-) But having to log in every single time is just too annoying.

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Since upgrading to version 32, firefox always opens old tabs when starting, even though i do not have this option set. Version 33.0.3 does the same.

When I updated Firefox to version 32, it started to always show my tabs from the last session when it is started. I tried changing the option "when Firefox starts" to all three of the available choices. None of these changed the behavior. It still opens the tabs that were last opened. I waited for the next release (33.0.3) but the behavior is still the same. I would like Firefox to open to my selected home page.
I'm running Windows 7 Pro.

One possibility is that Firefox keeps crashing during shutdown, and so Firefox is recovering from a crash every time. But if you can see that it is shutting down normally in your testing, that probably isn't it.
Sometimes external software will create or update an optional settings file named user.js. For some reason, one of the things that often shows up in there is a preference to restore your previous session just once. However, because Firefox uses user.js to override your normal settings every time it starts, that then turns into a permanent change. To check for this and remove any user.js file you find, try this support article: [[How to fix preferences that won't save]].
Any luck?

Firefox always opens all tabs that were opened when last closed

Firefox, out of the blue, started to always show my tabs from the last session when it is started. I checked that Firefox not listed in the task manager list after closing. So I tried the following:
- changing the option "when Firefox starts" to all three of the available choices
- change the browser.startup.page setting to 0 manually via "About:config"
- starting Firefox in safe mode.
None of these changed the behavior. It still opens the tabs that were last opened.
I am running V25.0. Any suggestions? This is a major annoyance.

Hello,
Please make sure that you have not activated Firefox's restore tabs feature. See the article here:
[https://support.mozilla.org/en-US/kb/restore-previous-session#w_configuring-session-restore Configuring session restore]
If it is enabled then you can disable it by following the instructions in that article.
I hope that helps. Let me know if not.
EDIT: sorry I linked to the wrong article. Fixed now.

When i stay on another tab for a long time and then goes back to the facebook tab, firefox will open the tab for about 5-10 seconds...it looks like a lag

if i use firefox and open tabs, the moment that i go back to the facebook tab, it would take firefox 5-10 seconds to open the facebook tab.it's really annoying

That is most likely caused by Firefox releasing memory used in that tab to minimize the memory that is currently in use. 
This includes memory that stores the DOM tree and that tree needs to be rebuild to allow navigation scrolling and clicking items on the page. 
On complicated pages that have a lot of elements this can take a few seconds.
See also:
*http://blog.kylehuey.com/post/21892343371/fixing-the-memory-leak about:khuey - Fixing the Memory Leak

Firefox opens with a window that says "Checking for compatibility for Add-ons" then it always opens 2 tabs... one with my home page and one that says Congratulations, Firefox is up to date. How can I stop it from starting that way?

Firefox opens with a window that says "Checking for compatibility for Add-ons" then it always opens 2 tabs... one with my home page and one that says Congratulations, Firefox is up

Hi konee,
You should look at [https://support.mozilla.com/kb/Firefox+has+just+updated+tab+shows+each+time+you+start+Firefox this article about that specific issue] and the article [http://kb.mozillazine.org/Preferences_not_saved Preferences not saved]. These should give you all the information you need!
If that doesn't work:
# Type about:config in the address bar
# Click ''I'll be careful, I promise'' if prompted
# In the Filter input field type ''startup''
# Double click on startup.homepage_override_url
# Delete the text string and click ''OK''
# Close Firefox and reopen the window to verify that it has worked.
Hopefully this helps!

My firefox always opens a crash report when I close it. Even if I have no tabs open and close firefox.

The Crash information is:
AdapterDeviceID: 95c4
AdapterVendorID: 1002
Add-ons: TFToolbarX@torrent-finder:1.2.6,{1de0de3c-0b5c-4f67-90c6-689623894991}:0.3,{9fb7d178-155a-4318-9173-1a8eaaea7fe4}:2.1.11,{B17C1C5A-04B1-11DB-9804-B622A1EF5492}:1.2.1,{c0c9a2c7-2e5c-4447-bc53-97718bc91e1b}:5.4,{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}:1.3.9,{D4DD63FA-01E4-46a7-B6B1-EDAB7D6AD389}:0.9.8,{ef4e370e-d9f0-4e00-b93e-a4f274cfdd5a}:1.4.4,{b9db16a4-6edc-47ec-a1f4-b86292ed211d}:4.9.5,[email protected]:4.0.2,{1E73965B-8B48-48be-9C8D-68B920ABC1C4}:10.0.0.1410,avg@igeared:7.008.031.001,[email protected]:1.3.5
AvailableVirtualMemory: 3804364800
BuildID: 20110902133214
CrashTime: 1316851060
EMCheckCompatibility: true
Email: [email protected]
FramePoisonBase: 00000000f0de0000
FramePoisonSize: 65536
InstallTime: 1315413340
Notes: AdapterVendorID: 1002, AdapterDeviceID: 95c4, AdapterDriverVersion: 8.872.0.0
D2D? D2D+
DWrite? DWrite+
D3D10 Layers? D3D10 Layers+
ProductName: Firefox
ReleaseChannel: release
SecondsSinceLastCrash: 452
StartupTime: 1316850895
SystemMemoryUsePercentage: 78
Theme: LavaFox_V1-Blue
Throttleable: 1
TotalVirtualMemory: 4294836224
URL: https://support.mozilla.com/en-US/questions/new?product=desktop&category=d2&search=My+firefox+always+opens+a+crash+report+when+I+close+it.+Even+if+I+have+no+tabs+open+and+close+firefox.&showform=1
Vendor: Mozilla
Version: 6.0.2
Winsock_LSP: MSAFD Tcpip [TCP/IP] : 2 : 1 :
MSAFD Tcpip [UDP/IP] : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [RAW/IP] : 2 : 3 :
MSAFD Tcpip [TCP/IPv6] : 2 : 1 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [UDP/IPv6] : 2 : 2 :
MSAFD Tcpip [RAW/IPv6] : 2 : 3 : %SystemRoot%\system32\mswsock.dll
RSVP TCPv6 Service Provider : 2 : 1 :
RSVP TCP Service Provider : 2 : 1 : %SystemRoot%\system32\mswsock.dll
RSVP UDPv6 Service Provider : 2 : 2 :
RSVP UDP Service Provider : 2 : 2 : %SystemRoot%\system32\mswsock.dll
This report also contains technical information about the state of the application when it crashed.

Have a read of the rather complicated article
* [[firefox crashes]]
* and for anyone with firefox crashing before you can key in about:crashes see: http://kb.mozillazine.org/Breakpad#Location_of_crash_reports
I note you have found bp-54df2ba6-de52-405d-9ccc-4dd272110924 have you any other recent crash signatures or crash IDs, the one you provide seems rather uncommon [https://crash-stats.mozilla.com/report/list?product=Firefox&query_search=signature&query_type=exact&query=karasx2.dll%400x2535&reason_type=contains&date=09%2F24%2F2011%2001%3A44%3A07&range_value=1&range_unit=weeks&hang_type=any&process_type=any&do_query=1&signature=karasx2.dll%400x2535 [karasx2.dll%400x2535]]
Do you still get the problem in [[safe mode]] and with default themes, and all plugins disabled. Note common causes of crashes are malware, and versions of the software IDvault. (do you use IDvault ? - often provided by Comcast)

Firefox now always opens four tabs when I start it. (home page, plus three latest add-on updates)

I updated Firefox and all the add-ons. Since that time, Every time Firefox is opened, it always opens four tabs.
One is my home page. One says Firefox has been updated. The other two are the notices for two add-ons that were updated.
It all began at the time I last updated my "Version-Three-Point-Something-Something..."
I tried upgrading to the latest version of Firefox.
This did not change my problem.
Thanks for your time.
NS

I've tried all your suggestions. Thanks.
No change occurs when I try resetting the home page to "default."
It still opens my home page www.google.com and those other tabs.
I tried the steps in the article. No change.
I've also tried removing the addons and reinstalling them.
No changes - except that one or two fewer tabs pop up.
I have noticed that every restart of Firefox includes a "checking for compatibility of addons" pop-up.
In Add-ons Manager, I can un-check the "Update Add-ons Automatically."
Again, no change.
I was able to capture a few screen shots for you.
Thanks for your patience with me.
NS

Why Firefox always opens with last session tabs?

When I open firefox always opens with last session tabs? How can I fix it?

You can check if you have a user.js file in the Firefox profile folder that sets the browser.sessionstore.resume_session_once pref to true.
*http://kb.mozillazine.org/browser.sessionstore.resume_session_once
The user.js file is only present if you or other software has created this file and normally it wouldn't be there.
You can check its content with a plain text editor (right-click: "Open with"; do not double-click).
The user.js file is read each time Firefox is started and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.
You can delete the user.js file if you didn't create this file yourself.
You can use this button to go to the currently used Firefox profile folder:
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
*http://kb.mozillazine.org/Profile_folder_-_Firefox
Windows hides some file extensions by default.
Among them are .html and .ini and .js and .txt, so you may only see file name without file extension.
You can see the real file type (file extension) in the properties of the file via the right-click context menu in Windows Explorer.

Why won't firefox open new tabs for hotmail?

Firefox always opened hotmail in a new tab, but now it only opens in a new window. What happened?

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]]
You can look at these prefs on the about:config page. 
* http://kb.mozillazine.org/browser.link.open_newwindow (3)
* http://kb.mozillazine.org/browser.link.open_newwindow.restriction (0)
Some extensions that you can look at:
* Tabberwocky: https://addons.mozilla.org/firefox/addon/14439
* Tab Mix Plus : https://addons.mozilla.org/firefox/addon/1122

Want to open 2nd tab and have it load the home page which the first tab opens.

Want to open 2nd tab and have it load the home page which the first tab opens. The first tab opens Google's advance search, the second tab opens a blank window. I always want Google to be in a new page.
== This happened ==
Every time Firefox opened
== always

You can look at one of these extensions:
NewTabURL : https://addons.mozilla.org/firefox/addon/2221
New Tab Homepage : https://addons.mozilla.org/firefox/addon/777

Despite setting a Home Page Firefox always opens in the last page viewed. How do I solve this?

I have followed the instructions for setting a Home Page. Firefox always opens in the last page I viewed. Clicking on the Home icon does take me to my Home Page once Firefox has opened.

You can check if you have an user.js file in the Firefox profile folder that sets the browser.sessionstore.resume_session_once pref to true.
*http://kb.mozillazine.org/browser.sessionstore.resume_session_once
Your System Details List shows that you have a user.js file in the profile folder to initialize some prefs on each start of Firefox.
The user.js file is only present if you or other software has created it, so normally it wouldn't be there.
you can check its content with a plain text editor if you didn't create this file yourself.
The user.js file is read each time you start Firefox and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.
*http://kb.mozillazine.org/Preferences_not_saved

Do you want Firefox to save your tabs for the next time it starts?

FF 27.0.1 on Linux Mint 16 XFCE, up to date.
I have my Preferences set to 'Show my home page'.
Every time I close FF with the X in the top left corner, it comes up and asks me "Do you want Firefox to save your tabs for the next time it starts?". I check the box not to be asked next time, and have tried both Save and Quit, and just Quit. When I open the browser again it seems to randomly decide whether to open all the tabs I had last time, or sometimes (rarely) just my home page tabs.
I don't want it to open all the tabs I had open, and I don't want the question every time I quit FF. I've used FF for years with XP, but I am new to Mint.

Does setting the "warnon" prefs on the about:config page to false has any effect?
*browser.tabs.warnOnClose
*browser.tabs.warnOnCloseOtherTabs
*browser.warnOnQuit
Make sure that you do not run Firefox in full screen mode (press F11 or Fn + F11 to toggle; Mac: Command+Shift+F).
*https://support.mozilla.org/kb/how-to-use-full-screen
If you are in full screen mode then hover the mouse to the top of the screen to make the Navigation Toolbar and Tab bar appear. Click the Maximize button (top right corner of the Navigation Toolbar) to leave full screen mode or right-click empty space on a toolbar and choose "Exit Full Screen Mode" or press the F11 key.

Firefox is opening new tabs on corrupted sites on it's own

I am using Firefox on a Samsung NC10 running XP Professional.
About 4 weeks ago I was hit with a fake Malware virus, which I have successfully removed using Malwarebytes and Registry Mechanic.
Since then Firefox is periodically opening new tabs for no reason which invariably take me to unsafe corrupted websites.
Can you tell me how I can stop this happening

I have solved this problem on my computer using the Microsoft® Windows® Malicious Software Removal Tool from here:
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=ad724ae0-e72d-4f54-9ab3-75b8eb148356
My computer was also unable to access the Microsoft update site, so I had to use another computer and a usb drive.
I ran a full scan which took several hours, but it found an infection that Malwarebytes and AVG didn't.
Following the scan I was able to update from Microsoft update and, so far, no more spurious pages starting on their own

Everytime I click to open Firefox it opens TWO Windows for Firefox. This only started after I installed Fierefox 5.

I already gave the details in the question.

Please see this articles: 
* [[Multiple tabs open when starting Firefox]] 
* [[Firefox keeps opening many tabs or windows]] 
If this answers your question, please click the '''Solved it''' button next to this post after you log in into the forum. This will help others searching for a solution to the same subject.
Thanks.

Why does Firefox repeatedly open new tabs when I open a .php file?

Hey guys!
I do web development and design. I've just set up my PC (Ubuntu 14.04 LTS) and installed my choice of software.
On the .php files I set Firefox as the default software to open with but now it opens about 50 odd tabs in the space of 3 seconds. How do I fix this?
Kind regards,
-Trey

You've hit a bug that happens when you set Firefox as the external "helper" application used to open a type of file (the "Warning!" paragraph [http://kb.mozillazine.org/File_types_and_download_actions#Setting_an_automatic_action here] links to the related bug reports, if you're interested).
See [[Firefox repeatedly opens empty tabs or windows after you click on a link]] for how to fix this.

Firefox always opens 2nd tab for Yahoo sign in

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