Hi! Try dragging the Windows to each side of the screen, so both snap on the right and left sides respectively!

I just tested this with 57/Win 10 on a laptop and it works fine. Using the Windows key + cursor keys should move/snap your Firefox window accordingly.

Do you know if you have any extensions (or software outside of Firefox, e.g. gaming keyboard drivers) installed that could possibly disrupt the funcionality of the Windows key?

Thank you for using Firefox!

Mkll said

Hi! Try dragging the Windows to each side of the screen, so both snap on the right and left sides respectively!

No, this didn't work.

vesper said

I just tested this with 57/Win 10 on a laptop and it works fine. Using the Windows key + cursor keys should move/snap your Firefox window accordingly. Do you know if you have any extensions (or software outside of Firefox, e.g. gaming keyboard drivers) installed that could possibly disrupt the funcionality of the Windows key? Thank you for using Firefox!

No. I don't have any extensions etc installed.

Hi there!

If it's still not working, I would be very grateful if you could help us make Firefox work better by filing a bug and providing as much information as you can.

You can find instructions on filing informative bugs here: https://developer.mozilla.org/en-US/docs/Mozilla/QA/Bug_writing_guidelines

Thank you for using Firefox!

Hi, I had this issue and resolved by it changing the theme from Default to Light.

(go to Addons, then Themes. Then enable the White Theme).

To test, I changed back to the default theme and the issue returned. So I assume the error is with the theme.