Why does Firefox open new windows unnecessarily, sometimes opening them on top of existing windows? Is this a setting problem?

When I try to open a new tab in the existing window, Firefox either opens a new window or overwrites the content in a different, existing window...

This may be related to session restore.
*[https://bugzilla.mozilla.org/show_bug.cgi?id=774943 bug 774943] - Session restore puts "+" button in the wrong spot and hides first tab
*[https://bugzilla.mozilla.org/show_bug.cgi?id=714382 bug 714382] - Leftmost tab is hidden when reopening browser window
([https://bugzilla.mozilla.org/page.cgi?id=etiquette.html please do not comment in bug reports])

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Why does firefox transfer data every time I open up applications such as facebook games. it takes the games longer to load because of this.

Connecting to my home page is quick...I transfered all my bookmarks (favorites) and settings as suggesetd from internet explorer. I figured this would only happen the first time I opened up games on facebook using Firefox...but it happens every time.

I'm sorry you are having this trouble. I can assure you that we want you to be using the homepage of your choice, and w are not even partnered with google anymore, for this isn't something Mozilla is doing on purpose (we will always respect your user choice)
I'd try the following:
* Sometimes this can be caused by a corrupted Firefox profile. Try the steps at [[How to fix preferences that won't save]] and let me know if that works.
* If that fails, try a Firefox Refresh, [[Refresh Firefox - reset add-ons and settings]]
* Finally this can be caused by malware. Try scanning for malware with the scanners at [[Troubleshoot Firefox issues caused by malware]]

Why does Firefox hang when I try to open yahoo? It also hangs after I use it for a little bit.

When I try to open yahoo Firefox will hang and when I try to restart it will close but stay running. It seems to have started when yahoo went to the new version.I reset my screen resolution to 1152 by 864 pixels like yahoo said no difference. Firefox will also hang if I go to several web sites with out going to yahoo. I changed my home page to Hotmail instead of yahoo and it will open just fine. Any help will be appreciated. Rodney. [email protected]

Please see the following articles [[Firefox Hangs]] and [[Firefox Crashes]]

Why does Firefox 28.0 keep crashing and opening up random tabs?

I'm running Firefox 28.0 on a Windows 8.1 laptop. Recently, it began opening up random tabs to spam websites and it's SUPER annoying. Then, the other day it began to do this thing where it'll stop responding. Rather than just freezing up for a second like it used to, it won't unfreeze and I have to restart Firefox. I reset Firefox today, and that didn't solve any of my problems.
System specs;
OS: Windows 8.1
Processor: Intel(R) Core(TM) i3-3227U CPU @ 1.90GHz 1.90 GHz
Installed memory (RAM): 6.00 GB (5.88 GB usable)
System type: 64-bit Operating System, x64-based processor
Pen and Touch: Pen Support
Windows is activated

I've already done this, and it says nothing is wrong with my system.

Why does Firefox create a folder "~/Download" when the "General" tab of the preferences window is selected in Linux?

This bug exists in 3.6 (and perhaps earlier) and 4.0. Simply selecting the General preferences tab creates folder ~/Download no matter what option is currently set for the download directory.

Try disabling hardware acceleration. Many visual bugs can be attributed to issues with graphics drivers.
(Firefox -> Options -> Advanced -> General -> [ ] Use hardware acceleration when available)

Why does Firefox screw up every time I open it!!

I am sick and tired of Firefox freezing up, running slow, slow in Facebook, Shockwave errors,Script errors etc.
I reset Firefox no help, I ran C Cleaner no help, cleaned out cookies no help. deleted history no help, ran disk clean up no help. I go to Internet Explorer no issues, but I prefer Mozilla.
Where do I go from here?

Would defraging help, because I/E Browser works fine?

Why does firefox close every time I try to send email with Hot mail and I have no other problems?

It looks like other people are having the same problem with Hotmail from the posts in the Hot mail forum. They suggested I contact support for my browser. I thought Firefox was the problem, I uninstalled it and installed the newest version. CC cleaner is used every time my computer reboots and Firefox is set to remove history each time it restarts. I defrag and shred free space weekly. My computer has no other issues whether on line or off. The problem of Hot mail crashing my browser/s started over a week ago. I am able to access my account/read/ click on links/delete/clear spam folder . . . . but the instant I click on reply, new, compose, (?) any browser will crash within 20 seconds. There have been no recent changes to my computer BEFORE Hotmail began crashing my browser/s. I have had {removed email address} for many years and this is the first time I have seen this happen. I do not receive error messages, it simply closes my browser. Firefox is my primary default browser. As I said Firefox was re-installed AFTER this started happening. I have 3 gmail accounts , they all work fine. I have too many contacts in my Hotmail account to open a new account with another provider. This is my personal email not business. It look as if a lot of people are having this same issue with Firefox?!?

Does it help if you disable the plugin-container process?
See http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins

Why does Firefox need a refresh when high contrast theme is selected?

Shouldn't it change content immediately when it detects a theme change? IE 11 does this and it would be a really nice-to-have feature, especially when it comes to accessbility constraints...

cor-el thanks for the reply, NoSquint seems quite useful but unfortunately it does not cover my use case. I have a use case where an external application is able to dynamically set the selected theme at the OS level, that is, set it to High Contrast Black or switch it back to the default Windows 7 Aero theme, so you should assume that i do not have any control over what is happening at the OS level regarding the selected theme, hence cannot "disable a high contrast theme in the Operating System".
I see that some basic UI elements such as the select box arrow handle and radio buttons change immediately, but the overall outlook of the page (e.g. background colors, text colors) do not. Could this be solved with me implementing a Firefox extension which would interface with the system "theme-changed" event and perform a re-rendering of the page at that point? I am currently trying to find some info on this...

Why does the plug in stop working sometimes

Why does the plug in stop working sometimes?

Is your pc. laptop, whatever Windows -ana what version, like Windows Vista, or Windows 10.
What bit is it? 32 or 64?
You can get that info by right clicking on "My Computer" Uusually on the desktop) and selecting Properties in the drop down menu.
And what version of Fire Fox are you using?
And which plugin are you using, and is it for Flash Player?
This info will help someone to answer your question.

Why does Firefox give this message when I do not have another program running "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."

Question
why does Firefox give this message when I do not have another program running or another window open - "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." edit

See also "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
*https://support.mozilla.com/kb/Firefox+hangs

Want new tab to open to home page and why does firefox not have a simple check box in the options because I can't keep going through a long procedure each time

I want new tab to open to home page and why does firefox not have a simple check box in the options because I can't keep going through the long tedious procedure each time I install firefox. It is something that should be in the options tab , and I want to know why it isn't. I am totally frustrated with firefox and getting ready to switch.

You can use the SearchReset extension to reset some preferences to the default values.
*https://addons.mozilla.org/firefox/addon/searchreset/
Note that the SearchReset extension only runs once and then uninstalls automatically, so it won't show on the "Firefox > Add-ons" page (about:addons).
If you do not keep changes after a restart or otherwise have problems with preferences, see:
*http://kb.mozillazine.org/Preferences_not_saved

Why does Firefox always block any link I try to open going to a web page when I don't have pop up blocker on?

Why does Firefox always block any link I try to open going to a web page when I don't have pop up blocker on? First off they are not even pop ups....your crap blocks everything and don't save user names &/or passwords when you have it checked. Also in your tutorials about solving this issue says it has the word "OPTION" .......no, it never says option to allow you to bypass it and etc. Only thing is says is "ALLOW" . That would be nice , but the problem is it will not allow it from then on. It only allows it right then and then you have to refresh...after that to open again it blocks it again.....HOW STUPID?!!!!!
It always say that this is preventing this page from automatically redirecting to another page. THIS IS WHAT I AM TRYING TO DO...GO TO ANOTHER PAGE........I DON'T NEED YOUr BROWSERS PERMISSION TO DO THAT. THAT IS WHAT A *%#$&*(&*%$$%% BROWSER IS FOR TO GO TO OTHER PAGES......THEY ARE NOT POP UPS!!!!!
YOU STUPID BROWSER ACTUALLY BLOCKS EVERYTHING AND THAT SUX!!!
HELP!!

Are you using "Clear history when Firefox closes"?
In case you are using "Clear history when Firefox closes":
*do not clear the Cookies
*do not clear the Site Preferences
*Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
*https://support.mozilla.org/kb/Clear+Recent+History
Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.
Clearing cookies will remove all specified (selected) cookies including cookies with an allow exception that you want to keep.
Let all cookies expire when you close Firefox.
*Firefox/Tools > Options > Privacy > Cookies: Keep until: I close Firefox
You can choose to keep third-party cookies from visited sites if necessary.
Create a cookie 'allow' exception for cookies that you want to keep.
*Firefox/Tools > Options > Privacy > Cookies: Exceptions

Why does FireFox open as a very small box in the top l/h corner and i have to resize it every time

Why does FireFox open as a very small box in the top l/h corner and i have to resize it every time this only occurs on the initial opening up of F/Fx after boot-up

Open the system menu via Alt+Space and see if you can resize that window. 
If that works then close Firefox (File > Exit/Quit) to save that setting.
See also:
* http://kb.mozillazine.org/Resizing_oversize_window
If the above didn't help then see:
* http://kb.mozillazine.org/Corrupt_localstore.rdf

Why does right clinking on link and selecting open in new tab does not work?

Why does right clinking on link and selecting open in new tab does not work?
It opens up a blank page. The only way to make the link work is to click on the navigation bar in the new tab and press enter to reload the link.

Do you have that problem when running in the Firefox SafeMode? ''A troubleshooting mode.'' 
1.You can open the Firefox 4.0 SafeMode by holding the '''Shft''' key when you use the Firefox desktop or Start menu shortcut. 
2. Or use the Help menu item, click on '''Restart with Add-ons Disabled...''' while Firefox is running. 
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut to open it again.''
If not, see this: 
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes

Why does Firefox sometimes ask me if I want to save my tabs when I close, and sometimes it does not? I usually want to save them, so this is a pain. I'm on a Mac, OS 10.5.8

Why does Firefox sometimes ask me if I want to save my tabs when I close, and sometimes it does not? I usually want to save them, so this is a pain. I'm on a Mac, OS 10.5.8
== This happened ==
A few times a week
== don't know...

There can be various causes for this:
[[Firefox does not ask to save tabs and windows on exit]]

Why does Firefox open new windows unnecessarily, sometimes opening them on top of existing windows? Is this a setting problem?

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