Why does Firefox sometimes open an existing tab in a new window?

I assume this happens because I click in the wrong place or the wrong way. If i knew how it happens I could try to avoid it.

Yes, this happens to me all the time too, but I can just be clicking on a link within a page when it happens; my mouse pointer isn't anywhere near the tabs...??

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Why does Firefox keep Opening My Hotmail link in a new window?

I have went to Tool-internet options-tabs-Open new windows in tab instead. And when Im at msn.com and click on the '''hotmail''' link it keeps opening it in a new WINDOW and not a tab. just really anoying was wondering if im missing something in options to set this strait :)
Edit: and i have tried Control Panel-Internet Options too.

Yes, this happens to me all the time too, but I can just be clicking on a link within a page when it happens; my mouse pointer isn't anywhere near the tabs...??

Why does Firefox sometimes open a new window when I navigate to an existing tab?

I often have 7 or 8 tabs open in Firefox. Sometimes when I click on a tab, Firefox opens it in a new window instead of just going to that tab. I haven't figured out a pattern when it does this.

A very slight movement (usually downward) will cause the tab to "tear off"/"tear away" into a new window. You can drag the tab back to the original window from the new window.
You can install this Add-on to stop the "tear off"/"tear away" behavior:
*https://addons.mozilla.org/en-US/firefox/addon/bug489729-disable-detach-and-t/
'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''
Not related to your question, but...
You need to update some plug-ins:
*Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/
*Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.com/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox]
*Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

Why does Firefox keep opening 3 random tabs while browsing different websites?

Just to clarify: They are never spam websites. They may be 3 of the same website, but it is always random. I only browse safe websites. This usually happens while Stumbling (StumbleUpon).
For example:
StumbleUpon brought me to this website:
[[http://www.thecreatorsproject.com/blog/5000-fiber-optic-flowers-invade-museum-grounds-in-ifield-of-lighti]]
Then it also opened three of this webpage:
[[https://en.wikipedia.org/wiki/First_Earth_Battalion]]
They have nothing to do with each other. Why does this keep happening? I searched with Anti-Malwarebytes, SuperAntiSpyware and Microsoft Security Essentials. No viruses.
I have Windows Vista Home Basics 32-bit. And is running Firefox 8.0. (This problem existed in 7.0 and previous as well.

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

Firefox randomly opens an existing page in a new window

I open Firefox with no problem - it opens all my existing tabs. When I choose a tab, and run the cursor over a page (no button pressed) Firefox will randomly (not always) open that page in a new window. VERY annoying!

The problem occurs with no clicking or dragging, but thanks ...
~pete

I am currently using firefox 6.0 and whenever I select to open a existing tab in another new window, or attempt to drag a tab to another window firefox hangs and never responds. This used to work great, but now its worthless. Any ideas?

help !!

You do not have the properties in the Bookmarks Manager (Library), but you should have it if you right-click a bookmark the Bookmarks Toolbar or in the bookmarks sidebar.
On Mac you probably do not have it if you right-click an item in the Bookmarks menu (this menu is under control of the Mac OS), but I assume that this should work if you click the "Show your bookmarks" button on the Navigation Toolbar that is next to the star to bookmark the current tab and right-click an item in the bookmarks list that opens.

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]]

Firefox sporadically moves my current tab to a new window.

About 2-3 times per week, I'll be browsing with multiple tabs open, and Firefox will suddenly "close" my current tab and re-open it in a new window. I say "close" because the tab is not listed under "Recently Closed Tabs." Rather, Firefox seems to just move the tab to a new window.
I thought maybe there was a keyboard shortcut for this that I was accidentally hitting, but I can't find what the shortcut for that would be. Did I just miss it?
The site I'm visiting doesn't seem to matter, as it's happened with different sites, including my webmail service, Google, and Facebook. The number of tabs open doesn't seem to matter either, as it's happened with 50+ tabs and just now happened with 24 tabs (which is low for me).
== This happened ==
A few times a week
== About a month or so ago ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

Firefox 3.5/6 versions have a feature called ''tear-off tabs''.
You can detach a tab from the current window and open it in a new window by dragging a tab in the browser window.
You can drag that tab back to the tab bar in the original window to undo that detaching.
bug489729 (Disable detach and tear off tab): https://addons.mozilla.org/firefox/addon/12276

Why does Firefox sometimes put the New Tab "+" button to the left of my open tabs instead of to the right?

''dupe of https://support.mozilla.org/en-US/questions/932160''
[Re-posted with additional details when I thought this post had failed. Please respond to the other post and ignore this one. My apologies for the duplication.]
In some windows, seems more likely after a crash recovery (but not sure there's a connection), Firefox puts the New Tab "+" button to the left of my tabs instead of the right. This is annoying, because once you're used to clicking it to the right of your open tabs, it's confusing to sometimes find it to the left.
If I go into Customize mode, it still shows the "+" tab on the right, but as soon as I close Customize, it's really still there on the left edge of the screen.
Why does this happen and can I stop it? I have seen no reports of this problem posted by others, but it's been happening for me since at least Version 12 and not fixed by version 13.0.1.

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])

Why does firefox intermittantly open a new window when I click on an existing tab? This only happens when I have three or more tabs open.

Several times now Firefox 4.0.1, when clicking on a tab (three or more tabs open) I immediately moves that tab to it's own window and closes the tab in the existing window.

That is probably the "tear-off tabs" feature. A slight movement (usually downward) when clicking on an existing tab will cause that tab to "tear-off" and open in a new window. You can drag the tab back to the previous window. You can also install this add-on to stop the behavior: https://addons.mozilla.org/en-US/firefox/addon/bug489729-disable-detach-and-t/
 
 
'''You need to update the following.''' The Plugin version(s) shown below was/were submitted with your question and is/are out of date. You should update to avoid known security issues with the version(s) you have installed. Click on "More system info..." to the right of your question to see what was included with your question.
*Adobe Shockwave for Director Netscape plug-in, version 11.5.9.615
*Next Generation Java Plug-in 1.6.0_20 for Mozilla browsers
#'''''Check your plugin versions''''' on either of the following links':
#*http://www.mozilla.com/en-US/plugincheck/
#*https://www-trunk.stage.mozilla.com/en-US/plugincheck/
#*'''Note: plugin check page does not have information on all plugin versions'''
#*There are plugin specific testing links available from this page:
#**http://kb.mozillazine.org/Testing_plugins
#'''Update Shockwave for Director'''
#*NOTE: this is not the same as Shockwave Flash; this installs the Shockwave Player.
#*Use Firefox to download and SAVE the installer to your hard drive from the link in the article below (Desktop is a good place so you can find it).
#*When the download is complete, exit Firefox (File > Exit)
#*locate and double-click in the installer you just downloaded, let the install complete.
#*Restart Firefox and check your plugins again.
#*'''Download link and more information''': http://support.mozilla.com/en-US/kb/Using+the+Shockwave+plugin+with+Firefox
#'''Update the [[Java]] plugin''' to the latest version.
#*Download site: http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)
#**'''''Be sure to un-check the Yahoo Toolbar option during the install if you do not want it installed.
#*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/Firefox_:_FAQs_:_Install_Java#Multiple_Java_Console_extensions
#*Java Test: http://www.java.com/en/download/help/testvm.xml

Why does Firefox keep opening new Windows rather than a new Tab in the current window?

I have " Open a new Tab in the current Window" select in Preferences.
Why then does this version (Version 4) keep opening new Windows, rather than new Tabs in the current Window.
This feature worked fine in 3.6.1.3, but in Version 4, it is a frigging pain in the rigging!
C'mon, Mozilla - time for an URGENT update ...

That issue can be caused by an extension that isn't working properly.
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
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.com/kb/Safe+Mode

Why does Firefox not open my windows and tabs from last time until I have tried starting 3 or 4 times?

I have this problem with opening Firefox:
My Startup options are set to "When Firefox starts: Show my windows and tabs from last time"
However, each time I start Firefox, by clicking the icon in the Taskbar, it opens with a single blank tab.
I repeat this using "Open New Window" and when I have up to 3 windows, all with single blank tabs open, I close them all. Once more I use "Open New Window" which only then opens with my windows and tabs from last time.
Naturally, this induces initial panic each time, because I dread the thought of losing all my current tabs.
What is going on here?
How can I fix it?
< Firefox 27.0.1 with Windows 7 Home Premium.>

This started happening to me with the upgrade to v30. Previously, new windows did the proper thing of showing previous tabs/windows.
I have history on, not in private mode, and have cleared cache.

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.

Why does Firefox stop opening new browser windows when "Sync" is running?

I downloaded and installed Firefox Sync v1.4 to my Firefox v.3.6.10
While Sync is running, Firefox will not open a new window when I do any of the following:
* Click "New Window" from the File menu.
* Click "Open in a new window" from right-clicking a tab.
* Click a link with JavaScript to open the target in a new window.
No error messages, just no action. I updated Sync to the newest version 1.5 but the problem still exists. Disabling either version in the Add-ons window "fixed" the problem. Is there a setting that causes this problem? Are others experiencing this same problem?

Firefox 3.5 versions and later have a feature called tear-off tabs. 
You can detach a tab from the current window and open it in a new window by dragging a tab in the browser window. 
You can drag that tab back to the tab bar in the original window to undo that detaching.
bug489729 (Disable detach and tear off tab):
*https://addons.mozilla.org/en-US/firefox/addon/bug489729-disable-detach-and-t
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

Why does Firefox now open a new window "when I click on a link" while using? It's a new annoyance that only appeared when I downleaded or added an add-on or extension. Please help me! Thank you VERY much!

A new window opens when I click on a link or go to a new site.

Do you have that problem when running in the Firefox SafeMode? 
[http://support.mozilla.com/en-US/kb/Safe+Mode] 
''Don't select anything right now, just use "Continue in SafeMode."''
If not, see this: 
[http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes]

Why does Firefox sometimes open an existing tab in a new window?

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