x86-64 linux platform seems to be ok Rated 5 out of 5 stars
Thank you to Everyone!
I try to install the BOFH_org suggested x86-64 build .xpi file and all went fine! The interface language too (italian) coherent to the TB3 interface one (italian too).
What about the gdata-provider.xpi found in the same directory? Has it to be installed? What is it for?
p.s. My TB3 is that from the OpenSuSE build service that you could find here:
keep attention to mozilla directory, I mean that one without the ending semicolon (":").