Thanks Karlkarlchen wrote: ↑Wed Apr 08, 2020 5:53 amHi, Fires.Refresh your software list, please. The screenshot suggests that your locally cached list of available software is not up-to-date.
Click on the [Reload] button in Synaptic. - Upper left hand corner of the Synaptic application window.
By now the Ubuntu software repos offer Firefox 75.0. So you want Firefox 75.0. But the steps are as explained and illustrated in my post linked to above.
but i have an other problem now my google account is locked