Since i'm still unable to get the latest FF (in my language) i stick with FF 38.3 ESR. Now, any time i start FF after a while i'm prompted (internally) with this msg:
----------------------------------------- Software Update ------------------------------------
Unable to update
a recommended security and stability update is available, but you do not have the system permissions required to install it. Please contact your system administrator, or try again from an account that has permission to install software on this computer.
You can always get the latest version of Firefox at:
https://www.mozilla.org/firefox/-------------------------------------------------------------------------------------------------------------------
Why that? I'm logged in as user "tc" with all sudo rights?