Vivaldi (64-bit)

What's new in this version:

Changes:
- Thunderbird will no longer attempt to import account passwords when importing from another Thunderbird profile in order to prevent profile corruption and permanent data loss
- Devtools performance profile will use Thunderbird presets instead of Web Developer presets

Fixed:
- Thunderbird startup performance improvements
- Saving email source and images failed
- Error message was shown repeatedly when temporary disk space was full
- Attaching OpenPGP keys without a set size to non-encrypted messages briefly displayed a size of zero bytes
- Global Search entry box initially contained "undefined"
- Delete from POP Server mail filter rule intermittently failed to trigger
- Connections to POP3 servers without UIDL support failed
- Pop accounts with "Fetch headers only" set downloaded complete messages if server did not advertise TOP capability
- "File -> New -> Address Book Contact" from Compose window did not work
- Attach "My vCard" option in compose window was not available
- Improved performance of matching a contact to an email address
- Address book only recognized a contact's first two email addresses
- Address book search and autocomplete failed if a contact vCard could not be parsed
- Downloading NNTP messages for offline use failed
- NNTP client became stuck when connecting to Public-Inbox servers
- Various visual and UX improvements
- Various security fixes