Log Message:
thunderbird: Update to 68.10.0

Changelog:
Fixes

fixed Chat: Topics displayed some characters improperly
fixed Calendar: Filtering tasks did not work when "Incomplete Tasks" \ 
was selected

Security fixes:
CVE-2020-12417: Memory corruption due to missing sign-extension for ValueTags on \ 
ARM64
#CVE-2020-12418: Information disclosure due to manipulated URL object
#CVE-2020-12419: Use-after-free in nsGlobalWindowInner
#CVE-2020-12420: Use-After-Free when trying to connect to a STUN server
#MFSA-2020-0001: Automatic account setup leaks Microsoft Exchange login credentials
#CVE-2020-12421: Add-On updates did not respect the same certificate trust rules \ 
as software updates