When I start Firefox it opens two instances at once

v7.0.1, running under Windows XP:
I thought the Tabbed Browsing feature looked really useful and spent an hour or so created a number of Tab Groups from my bookmarks. However, now when I start Firefox it opens two instances immediately, one correctly with my Tab Groups available but also another with just the home page. Apart from not wanting the second instance, there's now the risk that if I close the wrong one first, all of my carefully set up groups will disappear.
Something has gone wrong - how to correct it?

You can try to delete the user.js in your profile folder:
https://support.mozilla.com/en-US/kb/Preferences%20are%20not%20saved
Follow steps 1 and 2 to get to the folder
If this doesn't work, try deleting user.bk as well?
(This worked for me when I deleted user.js and user.bk, although I actually copied it to my desktop first in case it didn't work.)
EDIT: When I looked at the user.js 's contents, removing the line:
user_pref("browser.startup.homepage_override.mstone", "rv:7.0.1");
also fixed the problem

Similar Messages

When I close Firefox and open another instance of it to look at a new site I get a pop up window telling me Firefox hasn't shutdown yet.

When I close Firefox and open another instance of it to look at a new site I get a pop up window telling me Firefox hasn't shutdown yet. I am aware of tabs, but I prefer to just open new windows.
Do I really need a pop up window telling me that I just closed Firefox? Is there a way to disable it in options? I can't even use Buzof program to auto click for me. I've never had this issue with any other browser and I find it incredibly annoying.

I am not clear what you mean by:
''the program will only alow 1 website for each time I boot my machine,''
Are you talking about Firefox or something else in the above statement. Firefox will, or should allow you to open quite a few tabs at startup if you wish, although it will be faster the fewer that you do open.
When you say
''I close it the program does not completely close ''
Again what is happening, what error messages if any do you see, and what exactly makes you think Firefox is not closing properly.
Presumably you have already clicked on the blue links in my first post and read those articles.

When I start Firefox it opens my tabs plus several other windows to sites I do not want (marketing, sales, poker etc.)

To clean up a day's session, I often close all applications including Firefox. When I re-open it, nmy tabs appear, but also three or four separate windows like "Poker site" or some "media" site, and other advertising sites. How can I prevent this?

You can click-drag the tab of the page you are viewing over to the homepage icon on the toolbar. When you drop it, a prompt will ask you whether you'd like to set it as your homepage. Click "Yes".
I hope that helps!
If this doesn't solve your problem, it's possible that another piece of installed software is changing your homepage.

When I load Firefox I have two instances of my mail programs initiated, how do I remove one?

I thought it was a setting within colorful tabs, and there weren't any settings for startup tab information on the binary turf webpage

Is this a webmail service that is opening in 2 tabs? If it is check your list of home pages to make sure that the webmail service is not listed twice. For details of how to do that see [[how to set the home page]].

All of a sudden, my settings have been changed, my homepage, and EVERYTHING. No matter how many times I go in and change them again, the SAME pages open up when I start FireFox and I am constantly being asked if I want Yahoo as my start page and default s

I don't know what happened. All of a sudden, my settings have been changed, my homepage, and EVERYTHING. No matter how many times I go in and change them again, the SAME pages open up when I start FireFox and I am constantly being asked if I want Yahoo as my start page and default search engine. I click the box 'do not ask me again' and it comes up EVERY TIME. I change things like I don't want history remembered, and when I reload FireFox again, it's back to the way it was BEFORE. EVERY SINGLE TIME. I don't know why this is happening, or how to fix it. What do I do??

I do not want to download another virus program.. I do not believe it is a virus. I am running the full version of Norton 360 and it is doing a daily scan. I have Windows 7, 64 bit OS.
This is very irritating !! If I wanted Yahoo I would ask for it !

Tabs from last session aren't opening when I start FireFox

In options I have Show my windows and tabs from last time set for When Firefox starts. And I unchecked the warn me when closing multiple tabs option (although it was previously checked, and it wasn't warning me when it was checked).
The last few days I have had 1 window with 4 tabs open (each to a different site) when I exited Firefox. The next day when I start firefox it ends up opening 4 windows each showing about:blank. My tabs are not restored.
I have NOT cleared my history or any other information.

Who was the pop-up offer from?
Also, do you by any chance have chat utility installed called Digsby?

I upgrade firefox from 7 to 8 and now when i start firefox everytime it opens "getting start with firefox" page, in options i select the option 'show a blank page" how can i resolve this issue?

i upgrade firefox from version 7 to version 8, now when i start firefox everytime it open self the "getting start with firefox" website, in the options on firefox i select the 'show a blank page' but its not working. i am using firefox on windows XP- SP2.

Try restarting Firefox, the one time page(s) after starting a new release should disappear. Actually this last time with 8.0 they did not come up for me.
If that doesn't work then bring up '''about:config''' and place the url of the page into the filter. Right-click on anything that comes up and use "Reset".

I copied this from your 5.0 download information: "All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again." When I opened my computer today all my apptabs from yesterday had disappeared. Why?

Your download page for 5.0 stated: All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again.
I liked the convenience of using App Tabs and was disappointed to find that the ones I had set up yesterday were gone today. Am I doing something wrong?

Works fine for me, I can simulate your problem by improperly closing Firefox.
The correct way would be to close the windows you don't want and then to exit Firefox through the File ("'''Alt+F'''") menu then use '''Exit''' or '''Qui'''t depending on your system.
But '''I can simulate your problem''' by closing the good window with "X" in the upper right-corner first (the one with the app-tabs) and then close the other window by any means.
You restart Firefox and open a window, since you closed without app-tabs there are none so you just see a window with your home page.
Firefox has some things added to Firefox 4 and therefore in Firefox 5.
# "'''Alt+S'''" (Hi'''s'''tory menu)
# "'''Restore Previous Session'''" (that's the window without the app-tabs, but you have to this first)
# "'''Restore Recently Closed Windows'''" -- can choose which window to reopen based on name and the mouse-over tells how many tabs. or you just use "'''Restore All Windows'''" without the guessing.
''I know you are on a Mac, and this affects Windows user more than anybody else, but it does affect other systems besides Windows, occasionally, perhaps more often now with the plugins container.''
The following may not completely eliminate having to terminate Firefox through the Windows Control Panel but it will come very close.
'''Plug-in and tasks started by Firefox may continue after attempting
to close Firefox''' The "X" in the upper right-hand corner closes the
Window (same as Ctrl+Shift+W) but even if it is the last Firefox window,
it does not necessarily close Firefox .
The only '''proper way to exit Firefox''' is to use '''Exit''' through the
File menu, not the "X" in the upper right corner of last Firefox window.
In the Firefox 4 and 5 that would be Alt+F then X
* '''Firefox hangs''' | Troubleshooting | Firefox Support http://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit
Use the '''Windows Task Manger''' to remove all running firefox.exe in the "'''Processes'''" tab of the Windows Task Manager, then restart Firefox.
If Firefox will still not start, remove the parent.lock file from the profile which is created each time Firefox is started to prevent other Firefox tasks from running, see 
http://kb.mozillazine.org/Profile_in_use#Remove_the_profile_lock_file
'''Avoiding Problems with close/restart''' ''choose either extension''
:Use to close and restart Firefox after enabling or disabling an extension, switching to a new theme, or modifying configuration files, then you don't have to worry about delay or have to look in the Task Manager to see if Firefox is closed yet.
Both extensions use the same keyboard shortcut "'''Ctrl+Alt+R'''" or a file menu option.
*"'''Restartless Restart'''" extension for Firefox 4.0+ only (2 KB download ) https://addons.mozilla.org/firefox/addon/249342/
*For older versions use "'''QuickRestart'''" extension (34 KB download) ( https://addons.mozilla.org/firefox/addon/3559/

I have Google as my default home page in Firefox and the Google proser opens when I start Firefox, but every time I open a new tab it opens the Yahoo browser.

I have Google as my default home page in Firefox and the Google browser opens when I start Firefox, but every time I open a new tab it opens the Yahoo browser.

Do you have the FastStart extension?
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

I have Google as my default home page in Firefox and the Google browser opens when I start Firefox, but every time I open a new tab it opens the Yahoo browser.

I have Google as my default home page in Firefox and the Google browser opens when I start Firefox, but every time I open a new tab it opens the Yahoo browser.

Do you have the FastStart extension?
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

When I start Firefox a plugin update page keeps opening. This just started. How do I turn it off.

When I start Firefox my homepage and now the plugin update page open.

This issue was caused by a bug to blocklist plugins and that has been fixed. 
You can correct this issue by forcing the file blocklist.xml to update or wait until Firefox updates the blocklist.xml file during the next hours. 
That update will remove the severity="0" flags in the file that had caused the problem.
See:
* [/questions/832793?page=2#answer-198407]

Why does the Avast online security tab now suddenly always open when I start Firefox, it never use to happen?

As above sentence. Suddenly, every time I start Firefox it opens with the Firefox tab and the Avast online security tab. This didn't use to happen. I've tried disabling it via Firefox (as it was loaded on the computer long before I had Firefox) which solves that problem but then the large green tick icon doesn't show next to the search list to show the site is safe. It's very annoying that it has started doing this and certainly don't want it!

Sorry you might as well as written it in double dutch. I didn't understand it at all. Previously I have said I don't understand computer speak.

Why does my computer create web connections to addresses in the Amazon, Google and Youtube range when I start Firefox?

I think I already disabled all the updating functions, yet, SOMETIMES when I start Firefox, (with about:blank), my network monitor shows one to five connections to IP addresses mostly in the 74.125.225.x, 74.125.227.x, 74.125.228.x, and 72.21.x.x ranges. Those ranges include Google, Amazon, and Youtube.
I use Kaspersky, and have scanned multiple times for malware, and even had their technical support look into my computer. They see no malware. It is the Kaspersky Network Monitor that revealed the problem.
As I find them happening, I try to jot down the addresses, (quickly, because some of these connections only last a second or two), then add those to a firewall rule I created to try to combat the problem. Yet, next time I start, new addresses are "attacking". Of course, some get away, because I don't get the address jotted down before it goes away. At one point I used masking that ended up keeping me from Google and Youtube, so I have to add the addresses individually, and my block list in that one rule is 13 items long now. The only IPs not in those ranges are 23.5.251.27, and 173.194.46.5. Not sure where those go.
I used to get attacked by addresses in the range that includes Amazon ... 72.21.x.x. I have a separate firewall rule for them that has 33 addresses being blocked.
I should not have to do all that. Firefox should start and just sit there quietly until I start clicking or typing in it. This has been happening in Firefox versions going back to 11. May have gone on before that, but I wasn't tracking it then.
Also, it doesn't always happen, or, more precisely, with addresses I have not already blocked, (because my only way to know it's happening is when the connections are allowed to be made). It does not always happen right after Firefox is up, but sometimes several minutes later. I have started Firefox and just sat and watched the network monitor without doing anything in Firefox, and have seen this happen up to 15 minutes after I start Firefox ... mostly just two or three minutes when there's a delay at all.

Firefox does not do anything but sit on about:blank after I start it as long as I have a firewall rule enabled that completely blocks these subnets:
74.125.222.0/24
74.125.227.0/24
74.125.228.0/24
173.194.46.0/24
173.194.115.0/24
173.194.121.0/24
64.233.171.0/24
54.230.90.0/24
54.230.88.0/24
72.21.194.0/24
72.21.195.0/24
72.21.215.0/24
207.171.163.0/24
Otherwise, Fire fox creates connections to one to five addresses in those ranges. Note that there are more than 5 subnets above, but usually three connections satisfies whatever purpose these connections are being made for. If I had some links or whatever that is causing these connections, I would expect all of them would come up every time.
Also, these connections do not start immediately upon starting Firefox, they wait up to 15 minutes to start ... fifteen minutes of just sitting idle ... no actions on my part that could possibly initiate them. Usually these start within three minutes. A typical ploy of malware is to wait until no one is looking, or the until there's a forest to put their tree in so it won't be noticed.
While the above rules are in place, I do not have access to Amazon, Youtube, or Google, (or any of the various blog sites and services sponsored by Google, including Google Maps and Gmail). That list may not be complete, as I have other firewall rules in place that mainly block individual addresses.
It seems to me as simple as; figure out who owns those subnets, and you have your bad guys. Then go after them.
It's true that I have a bookmarks to Google, Gmail, and Youtube, but these are not "active" bookmarks nor RSS feeds. I have not voluntarily gone to Amazon on this computer.
The traffic being transmitted is unknown. It is usually not extremely large amounts of data ... less than a meg, but I have seen close to a Gig transmitted out of my computer, and over 400 meg transmitted to my computer, when I was not paying attention to block the offender. Even if it's small amounts, things like cookies, path structures, configuration settings, histories, etc. do not involve a lot of data, but, to me, represent a security breach, if someone decides to look at them unsolicited by me, not unlike your landlord, mortgage holder, or neighborhood police officer walking into your home while you're not there, and taking pictures of, or simply inventorying your belongings.
It is VERY much like some sort of backdoor malware. No malware is detected on my computer.
I looked at the suggestion above for OS changes for logging HTTP activity, but the author neglected to include instructions for backing out these changes after using them. If this were to create more jewels in a drawer the thief has access to, reformatting and restoring my drive is not the kind of back out process I enjoy. Therefore it would be foolish to apply them. To me it would be like bungee diving with no bungee. Fun until you hit the bottom. Give me the bungee, let me make sure it's short enough, then I'll dive.

When I start firefox, i get this message ( The instruction at "0x7b9c77a9" referenced memory at "0x7b9c77a9". The memory could not be "read" ) hs anyone any idea why? I have scanned with AVG and something simply called 'Trojan Remover' and they both fin

when I start firefox, i get this message ( The instruction at "0x7b9c77a9" referenced memory at "0x7b9c77a9". The memory could not be "read" ) hs anyone any idea why? I have scanned with AVG and something simply called 'Trojan Remover' and they both find nothing.... any advice would be greatly welcomed.. thanks
== This happened ==
Every time Firefox opened
== this morning 22/07/10

Lyall,
I have seen this before, a long time ago (several years), and I cannot
remember how/if we resolved it.
If this is an impotant issue to you, I suggest that you open a case with
BEA support.
Regards,
Peter.
Got a Question? Ask BEA at http://askbea.bea.com
The views expressed in this posting are solely those of the author, and BEA
Systems, Inc. does not endorse any of these views.
BEA Systems, Inc. is not responsible for the accuracy or completeness of
the
information provided
and assumes no duty to correct, expand upon, delete or update any of the
information contained in this posting.
Lyall Pearce wrote:
The title says it all really.
I see other posts getting replies.
This is a rather important issue, I have seen another post with a similar problem.
While not being a show-stopper it certainly raises concerns.
The application works ok until the application exits (in both development and
executable form)
Apparently this did not happen with Tux 7.1
It does with 8, I do not have 7.1 so I have no workaround.
..Lyall

When I start mozilla or open any link in a new window I get the desired page to load but an additional new tab page opens up along with it, fix?

When I start mozilla or open any link in a new window I get the desired page to load but an additional new tab page opens up along with it. I've tried switching my homepage to different things (new tab, firefox home, show blank page) but I always get an additional new tab to open. How do I get only a single page to open?

Hello,
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. 
'''Note''': ''This will cause you to lose any Extensions and some Preferences.''
*Open websites will not be saved in Firefox versions lower than 25.
To Reset Firefox do the following:
'''For Firefox versions previous to 29.0:'''
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox"[[Image:Button reset]] button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
'''For Firefox 29.0 and above:'''
#Click the menu button [[Image:New Fx Menu]], click help [[Image:Help-29]] and select ''Troubleshooting Information''.
Now, a new tab containing your troubleshooting information should open.
#At the top right corner of the page, you should see a button that says "Reset Firefox"[[Image:Button reset]]. Click on it.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!
Thank you.

When I start Firefox it opens two instances at once

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