An open tab suddenly is in a new window by itself in Firefox 28.0. Help!

Lately, when on a site (any) I notice at some point that the tab is now in a new window, when it was originally one tab among several in a different window. Can anyone tell me what might be happening and how to fix it? Thanks!

It could be the work of one of your add-ons, or even add / mal-ware. Look thru
your add-ons list and make sure you know what each one is there for. Also,
'''Windows > Start > Control Panel > Uninstall Programs.''' Go thru the list and
use a web search to check any that you don't know what they are. 
Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
Did this fix your problems? Please report back to us!

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Tabs suddenly switch to a new window

Somehow with these newer versions of FF (I'm using the latest), every now and then I'll be in a tab, when suddenly the tab becomes a new window or instance of FF. This is very annoying, since now the tab and site are no longer loaded into one instance with all my other preferred tabs.
I have no idea what I am doing to produce this effect -- not accidentally hitting a key, it seems to happen when I am moving the cursor, but apart from that .... I don't know.
Anyone know why this is happening?

This can happen if the left button is pressed over a tab and the mouse is lowered beyond the tab bar. For eg. if you left click a tab, hold it and move the mouse towards the center of the window and release the button, the tab would change to a new window. To put it back, grab that new window tab, bring it towards the task bar over the icon of the previous Firefox window and when the previous Firefox window opens, put it in that tab bar.

How can I prevent a tab from chaning into a new window by itself

When I play a video, and open another tab, the tab with the video will sometimes change into a whole new window. I don't click anything specific to make the tab change into a window, it will just do it a few minutes after I open the new tab. Does anyone have a clue on how to prevent this. Thank you!

Make sure that you do not drag a tab in the browser window. 
Current Firefox 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/bug489729-disable-detach-and-t

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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]]
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Dozens of open tabs lost! Synced them, reinstalled Windows and Firefox, set up Sync, looked up "tabs on other devices" in history -> Only a third or so listed.
Usually, when I reinstall Windows, I manually backup my Firefox bookmarks and open tabs, but because Sync has worked perfectly for me in the past, I didn't do it this time. I backed up all my other files and settings and whatnot from the rest of my system, then in Firefox I hit the Sync button (put in on the GUI so I see if it's syncing or done) for the last time, waited until the green rotating dot was gone, closed Firefox, shut down the system, formatted the drive and reinstalled Windows and Firefox. After setting up Sync I waited a while to make sure everything is on my system.
Then I wanted to have all the tabs and windows open as I had on the old system, so I went to the history and "tabs on other devices". I could already see from the small size of the list, that tabs were missing. I went through all of them, opened them and sorted them into windows.
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Not just new tabs that might not have been synced (although the button showed sync was complete), but also old tabs (from weeks ago) that must have been synced before. Actually maybe especially or even only the old ones are lost. And the lost tabs are not just from one of the open windows, but from several.
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They contain important websites that I didn't bookmark yet, articles that I wanted to read, windows with dozens of tabs on a topic that I did some research for and stuff like that.
What does the green circle mean? Does it indicate that the sync is complete (to the Firefox servers) or just that the changes have been saved locally and set up for some next scheduled sync with the Firefox servers?
Further info:
I always run the newest stable release of Firefox (v19 on both systems). Old system was Windows 8 Enterprise Evaluation, new system is Windows 8 Pro. My used Sync quota is about 10 MB. I had 4 Firefox windows open with different amount of tabs in each of them, from 10 to maybe 80 with an overall amount of 150-200. Most of them weren't loaded. Firefox start is set to "load last session" and tabs are set to "load when selected". Memory usage 500 MB - 1 GB.

I have most of the items bookmarked. Having 200 - 300 tabs open saves time, since I don't have to go to the bookmarks, if the tabs are already open. One problem has been crashes, but as long as I can restore a previous session, I can still get to the data. I had quite a few tabs open when I was planning to purchase a new computer. I also follow the stock market, and the weather. I was also looking at various VIrtual Private Networking (VPN) sites. At one time, I probably had 20 - 50 tabs open, just for those. I did bookmark a few, but unfortunately lost the VPN tabs, when Firefox crashed. Even if I don`t go to a particular group of tabs very often, leaving it open is faster, especially since I will know where they are. I often put the computer in standby mode, rather than shutting it off, especially if I will remain in the same location.

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* https://support.mozilla.com/kb/Safe+Mode
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Downloadable installation files available:
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Did this fix your problems? Please report back to us!
Thank you.

An open tab suddenly is in a new window by itself in Firefox 28.0. Help!

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