Does this happen with windows that were already open, or are these new windows? What are in those windows? Ads?

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Windows that are already open. Often each window has multiple tabs open. Not always; this morning one window had a single tab open and when I was browsing a different window, FF kept flipping to the single-tab window. There is a variety of content: webmail, various websites of content I’m researching, etc.

I already have Adblock Plus enabled.

Are you using any 'tab' add-ons?

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox. A small dialog should appear. Click Start In Safe Mode (not Refresh).

Is the problem still there?

I have restarted FF multiple times in safe mode. I reset FF. The windows are still randomly switching.

Okay, that should mean nothing in Firefox is the cause.

Start your Computer in safe mode with networking. Then start Firefox. Try Safe websites. Is the problem still there?

Starting The Computer In Safe Mode;
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Hi,

I have been dealing with this same problem for about 10 months now and it is very annoying. This is a bug in either Firefox or in Window 10 operating system - but I'm not a programmer/developer so I'm not sure which software has the bug. Here are more details about this bug so let me know if there is a link to send the info to the Firefox developers so they know about the bug.

To replicate the bug in action: I just need to open Firefox and have multiple tabs/windows open to various webpages. Then while I am either scrolling or typing in the current tab/window, the browser will jump from the current window to one of the other open browser tabs/windows. It is VERY annoying because it creates problems when you are typing in one screen and then lose some data because you realize later that the browser is jumping to other open screens while you were typing/editing!

I often have about 3 or 4 Firefox browser windows open with multiple tabs in each window. But this bug also occurs when I only have one browser window open with multiple tabs.

I have been having this same problem since I bought a new PC about 10 months ago. I had a Windows 10 Home OS on a desktop PC and I never had this problem. Then I bought a new Windows 10 Home OS on a desktop PC and this problem started happening. I exchanged that new PC for the same model and a new version of Windows 10 Home OS about five weeks later, and the new PC had the exact same problem. So it's either a Windows 10 operating system bug or else it's a Firefox bug. I use Firefox all the time, and I only use Google Chrome or Edge once in a while to test how my website page edits look in different browsers. So I'm not sure if this bug occurs in all browsers on a Windows 10 PC or if it's just Firefox that has the bug on a Windows 10 PC.

If anyone has a solution to fix this bug then please let me know and it will be greatly appreciated!!

Thank you for any advice!

I think it would be best for both of you to use this link, and let us know how things turn out;

http://answers.microsoft.com/en-US/windows/forum/windows_10

FredMcD said

I think it would be best for both of you to use this link, and let us know how things turn out; http://answers.microsoft.com/en-US/windows/forum/windows_10

Hi,

I posted the issue and the request for advice on the Microsoft Windows 10 community support forum as you asked. I will let you know if I get any answers that solve the problem. But I think it could be a Firefox bug that is causing this.

Here is the link to my Microsoft post: https://answers.microsoft.com/en-us/windows/forum/windows_10-networking/bug-web-browsers-automatically-switches-between/2e1ddb29-df38-4754-8108-0ab55bed9a5d?tm=1476915583301