Firefox suddenly stopped opening 'in a new window"when I ask-open"in a new tab"only

For the last two days, Firefox has suddenly stopped opening in a new window; Now, I can never have a window open at a time (even though she always let me open several tabs).
Tried everything down and rebooting not closing of course, but made no difference.
Don't have no knowledge of changing parameters - I changed or damaged something without knowing?
The only news I did recently, is download the add-on from the EPUB reader! Is there a link?

Thanks a lot for your suggestions

Start Firefox in Firefox to solve the issues in Safe Mode to check if one of the Add-ons is the cause of the problem (switch to the DEFAULT theme: Tools > Modules > themes).

  • Makes no changes on the start safe mode window.

See:

If this does not work in mode without failure, then disable all extensions and then try to find out who is the cause by allowing both the problem reappears.

  • Choose "Disable all add-ons" on issues to troubleshoot Firefox in Safe Mode to set window to disable all extensions.
  • Close and restart Firefox after each change through "file > exit ' (Mac: ' Firefox > leave";) Linux: "file > exit ')

Tags: Firefox

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