It looks like /usr/lib/abrowser/libnss3.so is corrupted. I would check the
health of your disk (its SMART data), e.g., from GNOME Disks (provided by the
"gnome-disk-utility" package, in Trisquel's repository).
That file is provided by the "libnss3" package (a dependence of Abrowser, but
Apparently not. Can't see any success with either 'tor-browser' or
'start-tor-browser' (in a terminal).
> ./start-tor-browser.desktop --register-app
Good to know. Does this also add the binary to the user's path so it can
be launched from a terminal?
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Tor Browser can be registered (this will add an entry in the menu) by running
this command in the Tor Browser Bundle directory.
./start-tor-browser.desktop --register-app