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Firefox opens "off screen"

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  • תגובה אחרונה מאת nab.layk

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Greetings support team. The problem is a bit complicated and I could't find anything similar to it on the net, so I'll try to explain in details what happened. One day after opening the browser I noticed that it didn't launch(there was no window). After opening it again I saw that all of my previously opened tabs were gone. After that I closed Firefox and went to check the task manager. I found that Firefox was still running after closing it. I couldn't wrap my head around it and killed the programm. Then I opened it again and got the same results: first launch: no Firefox window(nothing on the taskbar either), secound launch: one empty tab. After that I opened a new tab in Firefox through task manager and my screen "swiped right", I got access to Firefox window with all of my previous tabs, but all the other programms I had opened on the taskbar were gone. Somehow Firefox opens outside my screen on a "separate one" every first time I launch the app, and the only way to switch between "screens" is to open a new tab through task manager or launch a program that was previously active to switch back to previous "screen". It is also impossible to switch between opened windows on different "screens" using gestures on the touchpad or "Alt" + "Tab". I use a laptop and never even tried to attach/connect a second monitor. I don't have another monitor attached via bluetooth or any other means in device manager. I have the latest verion of windows 10 installed and updated. I have another PC, where I use the same Firefox with the same addons on the same Mozilla account, which has no such issues. I have tried renaming the file called "xulstore.json" to "xulstore.old" or deleting it entirely, this didn't resolve the issue.

Greetings support team. The problem is a bit complicated and I could't find anything similar to it on the net, so I'll try to explain in details what happened. One day after opening the browser I noticed that it didn't launch(there was no window). After opening it again I saw that all of my previously opened tabs were gone. After that I closed Firefox and went to check the task manager. I found that Firefox was still running after closing it. I couldn't wrap my head around it and killed the programm. Then I opened it again and got the same results: first launch: no Firefox window(nothing on the taskbar either), secound launch: one empty tab. After that I opened a new tab in Firefox through task manager and my screen "swiped right", I got access to Firefox window with all of my previous tabs, but all the other programms I had opened on the taskbar were gone. Somehow Firefox opens outside my screen on a "separate one" every first time I launch the app, and the only way to switch between "screens" is to open a new tab through task manager or launch a program that was previously active to switch back to previous "screen". It is also impossible to switch between opened windows on different "screens" using gestures on the touchpad or "Alt" + "Tab". I use a laptop and never even tried to attach/connect a second monitor. I don't have another monitor attached via bluetooth or any other means in device manager. I have the latest verion of windows 10 installed and updated. I have another PC, where I use the same Firefox with the same addons on the same Mozilla account, which has no such issues. I have tried renaming the file called "xulstore.json" to "xulstore.old" or deleting it entirely, this didn't resolve the issue.

השתנתה ב־ על־ידי nab.layk

פתרון נבחר

nab.layk said

Somehow Firefox opens outside my screen on a "separate one" every first time I launch the app, and the only way to switch between "screens" is to open a new tab through task manager or launch a program that was previously active to switch back to previous "screen". It is also impossible to switch between opened windows on different "screens" using gestures on the touchpad or "Alt" + "Tab".

This took me down a rabbit hole of the multi-desktop feature. Could you take a look at this section of a video showing how to move things between desktops. Once you empty out an unwanted desktop, I think you can close it using the X button at the upper right of the empty desktop.

https://youtu.be/ZUttvpJMq8E?si=bFjhrVflLA8R_V97&t=211

*Edit* Later he says if you are viewing a desktop you can press Ctrl+WindowsKey+F4 to merge it into the previous desktop, so the windows of desktop 2 would move into desktop 1. That sounds faster but I've never tried any of this myself.


I have tried renaming the file called "xulstore.json" to "xulstore.old" or deleting it entirely, this didn't resolve the issue.

I think it's a Windows issue, but since you are already familiar with where Firefox stores screen position (xulstore.json), you could open the file in a text editor and sanity check the first group of settings (this is mine at the moment):

"main-window":{"screenX":"7","screenY":"0","width":"462","height":"126","sizemode":"maximized"}

Does yours show peculiar values for the first two parameters -- position -- or the second two parameters -- size? (I don't know why the height is so short on mine. Annoying.)

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פתרון נבחר

nab.layk said

Somehow Firefox opens outside my screen on a "separate one" every first time I launch the app, and the only way to switch between "screens" is to open a new tab through task manager or launch a program that was previously active to switch back to previous "screen". It is also impossible to switch between opened windows on different "screens" using gestures on the touchpad or "Alt" + "Tab".

This took me down a rabbit hole of the multi-desktop feature. Could you take a look at this section of a video showing how to move things between desktops. Once you empty out an unwanted desktop, I think you can close it using the X button at the upper right of the empty desktop.

https://youtu.be/ZUttvpJMq8E?si=bFjhrVflLA8R_V97&t=211

*Edit* Later he says if you are viewing a desktop you can press Ctrl+WindowsKey+F4 to merge it into the previous desktop, so the windows of desktop 2 would move into desktop 1. That sounds faster but I've never tried any of this myself.


I have tried renaming the file called "xulstore.json" to "xulstore.old" or deleting it entirely, this didn't resolve the issue.

I think it's a Windows issue, but since you are already familiar with where Firefox stores screen position (xulstore.json), you could open the file in a text editor and sanity check the first group of settings (this is mine at the moment):

"main-window":{"screenX":"7","screenY":"0","width":"462","height":"126","sizemode":"maximized"}

Does yours show peculiar values for the first two parameters -- position -- or the second two parameters -- size? (I don't know why the height is so short on mine. Annoying.)

השתנתה ב־ על־ידי jscher2000 - Support Volunteer

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Oh my God. Thank you so much! Yes, the problem was indeed in multi-screen feature of Windows. I prefer not to clog interface, so I removed most of the buttons from the taskbar. Because of this I didn't see task view button and couldn't formulate search request correctly.

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