I opened Muon package manager and found "firefox transitional package" text - this is a transitional dummy package.It can be safely removed.Firefox is now replaced by the firefox snap.
I removed it and the result was only one Firefox entry on the application menu.
Opened the remaining Firefox entry and it was 98.0.2 - mozilla firefox snap for Ubuntu ...
In a Lubuntu Jammy test -
I opened Muon package manager and found "firefox transitional package" text - this is a transitional dummy package.It can be safely removed.Firefox is now replaced by the firefox snap.
I removed it and the result was only one Firefox entry on the application menu.
Opened the remaining Firefox entry and it was 98.0.2 - mozilla firefox snap for Ubuntu ...