Major Changes:
- New content.blocking.hosts.block_subdomains setting to disable subdomain blocking
- New downloads.prevent_mixed_content setting to prevent insecure mixed-content downloads
- New :tab-clone --private option, which clones a tab into a new private window
- In insert mode, <Shift-Escape> is now bound to fake-key <Escape> by default, i.e., sends an Escape keypress to the website.
Changelog: