Hello, So since Tbird updated to v68.10.0, my Lightning add-on no longer displays. It's still listed in the add-ons. I've followed the advice (https://support.mozilla.org/en-US/kb/calendar-updates-issues-thunderbird#w_lightning-disappears-after-a-thunderbird-update-release-and-beta-versions) to reset the extension value. Still no Lightning displayed. Tbird has just updated to v68.11.0 - same issue, even after following the instructions as above. Both Tbird & Lightning show as v68.11.0 I'm using Windows 10, v1909. Anything else to try? What have I missed? Thanks Mr G