Just tried to switch my firefox to the latest from mozilla and installed it in /opt . made a symlink to the usr/bin/firefox. Changed the edited firefox-esr.desktop icon file in /usr/share/applications with this addition "exec = /opt/firefox73/firefox %U". to point to the new firefox installation. When I click the .desktop icon directly, it launches the correct new installation of the Firefox, same as when i type firefox in terminal.
My problem is that the launcher menu Firefox icon still launches the old default/stock firefox (which is an old version 5 series too old) from the repositories how do i update that to fireup the new firefox
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