opening uncommanded windows
As of today, no change to Firefox, it tries to open what appears a speed dial item in a new window. This is being done without any input from me. If I hover over task bar and close new window a new different one tries to open.
Alla svar (1)
You may have ad/mal-ware.
Further information can be found in this article;
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no
Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.