How can I view 2 tabs at the same time?

I would like to view 2 pages simultaneously. I have dual monitors and I cannot open a second window or start a second Firefox. The function under File/New window does not open a new window. Trying to start Fire fox a second time does not work.
Unchceking "Open new window in a new tab under Tools/Options/Tabs " did not help.

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]]
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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