https://www.falkon.org/2019/03/19/falkon-310-released/

Changelog

• add support for writing plugins in QML
• add MiddleClickLoader Python plugin
• add page sharing to KDE Frameworks Integration plugin
• add basic support for client certificates (QtWebEngine >= 5.12)
• add support for registering custom protocol handlers (QtWebEngine >= 5.12)
• change search bar appearance to match other KDE apps
• use DBus instead of lockfile/socket to check and communicate with other instances (Linux) #404494
• whitelisted cookies are no longer deleted when deleting all cookies
• Python plugin support is now stable
• close entire tree after middle click on collapsed tabs in VerticalTabs plugin #399217
• fix some compatibility issues with QtWebEngine up to 5.12
• fix some possible crashes in AdBlock
• fix builds with standalone QtWebEngine releases