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where to find display settings 1 and 2

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I use a hp color monitor with my macbook pro. Usually works fine. Yesterday, i couldn't load firefox on my monitor. The icon was in my dock on both screens and I could not launch it on monitor screen. there is a setting somewhere in Firefox where you can choose Display 1 or Display 2. When I clicked on Display 1 the issue was fixed. Now I don't have my dock at the bottom of my monitor screen where I can launch Firefox, I have to load it on my laptop and then the firefox home page appears on my monitor. I can't find the settings for Display 1 and 2. Please help me understand and fix this problem. Thank you very much Keith Hope

I use a hp color monitor with my macbook pro. Usually works fine. Yesterday, i couldn't load firefox on my monitor. The icon was in my dock on both screens and I could not launch it on monitor screen. there is a setting somewhere in Firefox where you can choose Display 1 or Display 2. When I clicked on Display 1 the issue was fixed. Now I don't have my dock at the bottom of my monitor screen where I can launch Firefox, I have to load it on my laptop and then the firefox home page appears on my monitor. I can't find the settings for Display 1 and 2. Please help me understand and fix this problem. Thank you very much Keith Hope

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Hello khope2,

As far as I know there is no such setting in Firefox ....

Would you please take a look at this :

https://www.macworld.co.uk/how-to/mac/second-screen-mac-3621421/

and :

https://support.apple.com/en-us/HT202351

Or you could post your question here :

https://support.apple.com/

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You can check that you do not run Firefox in Full Screen mode (press F11 or Fn + F11 to toggle; Mac: Command+Shift+F).