How do I stop Firefox from opening each time I turn on my computer?

When I turn on my computer Firefox automatically opens up.
I want to stop this.
How do i stop this from happening?
This is a new thing.

See also:
* https://discussions.apple.com/thread/3700060?start=0&tstart=0
* https://support.mozilla.org/kb/Firefox+launches+automatically+when+your+computer+starts
* Control-click on the Firefox Dock icon and uncheck 'Open at Login'
* Click Accounts (in the System row of the System Preferences window)
** Click the Login Items tab
** Click on Firefox in the list
** Click the Minus (-) button

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After a recent update, everytime I open Firefox, the Add-ons dialogue box opens on top of the home page. How can I stop it from opening each time?

The question contains all the information I can provide

Ok I found a solution that worked for me, I simply dragged the user.js and the user.js.BAK to the desktop, before that I had done the same with the prefs.js and prefs.js.BAK, but that didn't help, so it's apparently the user file that was an error with.
It was the link from cor-el that helped me on the way http://kb.mozillazine.org/Preferences_not_saved It's at the bottom titled User.js file locks certain preferences. This article can also help https://support.mozilla.com/en-US/kb/Preferences%20are%20not%20saved
It have still not made a new user.js file, but everything runs fine, hope this can help others to.

How to stop iPhoto from opening each time I add a photo using Yosemite

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From where. I don't think you can keep it mininmized when importing because if it runs into a duplicate it will present a warning window for you to make a decision in. Therefore, it will always be open when importing.
You can send a feature request to Apple via http://www.apple.com/feedback/iphoto.html.

How do I stop Firefox from opening a new window when I go to a search item?

When I do a search, and click on a topic, Firefox opens a new window on the tool bar at the bottom of my screen. How can I stop this from happening?

I'm guessing you use Google for search. There is a setting in Google search to open each result in a new window. (When you use tabbed browsing, that means each result opens in a new tab.) You can check on whether you have that setting turned on as follows:
On a Google results page, click the button on the right side with the "gear" icon, then click Search Settings from the drop-down list. At the bottom of the page is the setting to open results in a new window.
Is that the culprit?

How can I stop Firefox from opening (to "File Not Found") when opening my Opera browser?

Ever since I installed Opera 10.61 on my new computer (Windows 7 Ultimate operating system), whenever I open Opera, Firefox opens one second later with the following error message:
'''File not found '''
Firefox can't find the file at /C:/Users/Nasheed/AppData/Local/Opera/Opera/temporary_downloads/client-en.xml.
* Check the file name for capitalization or other typing errors.
* Check to see if the file was moved, renamed or deleted.
TRY AGAIN.
<nowiki>****************************************************</nowiki> 
This happens EVERY TIME I OPEN THE OPERA BROWSER. How can I stop this from happening? I'm stumped.
[EXTRA INFO - I was unable to enable Firefox to access my previous profile on the new computer (despite putting the old profile in the appropriate Mozilla Firefox folder. So, there are now two profiles in that location.
After reading the answer to another forum member's question, I attempted to resolve the problem using Profile Manager, but I was unable to locate the Profile Manager. The Windows "Search" feature is not enabled on my new computer (nor can it be enabled from the Customize Start Menu options).]

Thank you for your response, Cor-el.
I had Opera set as my default browser since this began happening. I changed my default browser back to Firefox mainly because having Firefox open one or two seconds every time I open Opera was/is such a nuisance.
I believe this problem began because I attempted to manually transfer the files from my old computer to the new one (via the backed up files in my external drive). I was unfamiliar with Windows 7 when I did this. Microsoft changed the file set up from what I had been used to in Windows XP. I used XP for six years before being exposed to Windows 7 (I never had Vista).
I'm almost sure this problem has something to do with where I placed the application data when I was trying to reestablish the program set up on the new computer.

How do i stop firefox from opening multiple tabs on startup

on startup firefox loads my home page and opens a new tab how do i stop that from happening

Do you have a MySearchDial extension showing in Firefox/Tools > Add-ons > Extensions?
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Can you post the content of the user.js file in the current profile folder?
You can open the user.js file for inspection via the right-click context menu (do not double-click the file).
You can use this button to go to the currently used Firefox profile folder:
*Help > Troubleshooting Information > Profile Director: Show Folder (Linux: Open Director; Mac: Show in Finder)

How do I stop Firefox from opening its own homepage tab on top of my homepage?

Firefox keeps opening up its own website in my browser on top of my own home page even though I have reset the home page numerous times. Everytime I open firefox I have to reset my home page which works for a half-day or so and then ... we're back to the Firefox homepage. How do I keep Firefox from hijacking my browser?
P.S. I've tried all the stuff that's recommended -- resetting my homepage, etc ... and I'm just getting tired of having to do this. This is getting so irritating I'm going to stop using Firefox and start using another browser.

I am having a similar problem, I'm using "Show my home page" on start-up but firefox decides to always open to the last page visited regardless. I also generally close Firefox using the red X or with alt+f4. This problem is especially annoying when the last page 'visited' is an annoying pop-up ad that wasn't been caught by the pop-up blocker.

How do i stop firefox from opening the addons page and the page that tells me what version i am running

Firefox keeps opening the add ons page and a page telling me what version i am running every time i open it,how do i stop it from doing this
== This happened ==
Every time Firefox opened

try :
via about:config
startup.homepage_welcome_url",""
startup.homepage_override_url",""

How can I stop Firefox from opening pdfs in Google Docs?

Whenever I want to look at or download a webspage which is a Microsoft Word or a pdf document, I am automatically sent to Google Docs to view it. Mayvbe bexcauuse of my satellite connection, I cthen have huge problems in downloading these webpages. How can I disconnect Firefox from automatically opening these pages in Google Docs?

Thanks for the suggestion. Unfortunately, these settings are exactly the same on my troublesome PC as they are on my laptop which does not have this problem. The PC is Windows 7, and laptop is XP. I have in the past used the PC to access google documents.

Every day, I have to re-set all of my app tabs. How can I set them to open each time I turn my computer back on?

I never see the app tabs on my tool bar after I close the thing down for the night. Is that possible to keep them there??

App (pinned) tabs and Tab Groups (Panorama) are stored as part of the session data [1] in the file sessionstore.js [2] in the Firefox profile folder [3].
Make sure that you do not use "Clear Recent History" to clear the "Browsing History" when Firefox is closed because that prevails and prevents Firefox from opening tabs from the previous session.
* https://support.mozilla.com/kb/Clear+Recent+History
* [1] http://kb.mozillazine.org/Session_Restore
* [2] http://kb.mozillazine.org/sessionstore.js
* [3] http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox
It is also possible to use the "Show my windows and tabs from last time" setting, that is usually a more reliable way to restore session data.
* [http://kb.mozillazine.org/Menu_differences Firefox/Tools > Options] > General > Startup: "When Firefox Starts": "Show my windows and tabs from last time"
If you use cleanup software like CCleaner then make sure that Session is unchecked in the settings for the Firefox application.
*App Tab Initializer: https://addons.mozilla.org/firefox/addon/app-tab-initializer/

How do I stop Firefox from opening unwanted sites or (inescapable) dialogs

My Firefox, as soon as I open a web page opens either (1) an overlying dialog typically flashing saying I am the 1000000th person or my computer is slow or buy this or (2) another unwanted site in another tab typically trying to sell something. Cases of type (2) are annoying but at least the tab can be deleted but cases of type (1) prevent me from using Firefox at all because the dialog does not have an exit button so I have to stop Firefox to get rid of it. This problem only happens with Firefox - IE never has these problems. I have scanned for malware using 3 different programs and I have tried deleting Firefox and re-installing it (keeping my profile) but the problem is still there. If I knew what the process was I could at least delete the process.
I love my Firefox - please help!

You can check for recently installed suspicious or unknown extensions.
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
Do a malware check with several malware scanning programs on the Windows computer. 
Please scan with all programs because each program detects different malware. 
All these programs have free versions.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: Home Page: http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
*Spybot Search & Destroy: http://www.safer-networking.org/en/index.html
*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller: http://support.kaspersky.com/5350?el=88446
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

How do I stop Firefox from opening old tabs/windows after a crash?

whenever it crashes and i try to reopen the program, it opens all my old tabs and windows. often these are videos which all start playing at once. or worse, it opens the page that made it crash in the first place and crashes again.
how do i stop this annoying feature?
if there's no way to stop it, can you recommend a simple browser that doesn't try to think for you?

hello, enter '''about:config''' into the firefox address bar (confirm the info message in case it shows up) & search for the preference named '''browser.sessionstore.resume_from_crash'''. double-click it and change its value to '''false'''.

How do I stop Firefox from opening a new tab every time I open an Adobe file in Acrobat?

Every time I open a file in Acrobat, an empty blank tab opens in Mozilla Firefox browser. How can I stop this? Thank you.

hello dba1, does it work when you go into the ''acrobat reader > edit > preferences > general ''& click on the default application option at the bottom? in there reselect adobe's application and confirm this selection...

How does one stop Firefox from opening at login ?

I have Firefox opening up at login even though the 'open at login is unchecked'. I had firefox 'open at login'checked for a week. Now I do not want firefox to 'open at login'.
I have unchecked 'open at login' and I still get Firefox opening up at login. How can I stop the firefox box opening after login. Any suggestions?

Thankyou. I looked it up in the "help" menu and tried what was suggested there and it worked. I have also followed your direction - System Preferences>accounts>login items and deleted the firefox entry. Cheers

How do I stop Firefox from opening the Firefox start page as a tab when I open the browser?

New Dell Laptop and new Firefox download. Have used Firefox for several years. This time it loads the Firefox Start Page automatically as a tab every time I open the browser. I can't find how to turn it off. I did not set it up to do this intentionally.
Frank

See the [[Firefox has just updated tab shows each time you start Firefox]] article for details of how to solve this.

How do I stop Firefox from opening each time I turn on my computer?

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