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Join UsVersion 78.7.0, first offered to channel users on January 26, 2021
Extension API: Compose API now supports editing messages and templates as new messages
Extension API: composeHtml is now exposed in MailIdentity
Extension API: windows.update and windows.create now support titlePreface
Extension API: new Accounts API functions: accounts.getDefault() and accounts.getDefaultIdentity(accountId)
Extension API: body and plainTextBody are now used as compose mode selectors in setComposeDetails and begin* functions in Compose API
Theme: removed the double border around the task description field on the Tasks tab
Account Manager: When deleting the last remaining account, the default account was not getting cleared and still pointed to the no-longer-existing account
OpenPGP: Verification of an inline signed message would fail if it contained leading whitespace
OpenPGP: Various other minor bug and stability fixes
Mail Window: Quickfilter bar buttons disappear when hovered on Windows 10 High Contrast Black theme
Theme: folder properties dialog contained black text on a black background in dark mode
Theme: recipient pills in compose window were not visible in high contrast dark theme on Windows 10
Extension API: browserAction buttons were not restored after restart if they were moved outside the default toolbar
Extension API: browser.compose.beginNew could not override identity plaintext setting
Extension API: browser.compose.beginForward was ignoring ComposeDetails
Extension API: browser.compose.setComposeDetails did not properly handle Windows-style line endings
Various security fixes
Thunderbird performs sluggishly on macOS Big Sur