Bug 521026 mentions a similar issue with Thunderbird (with and without Lightning). The F8 key only works after opening the View menu once. Maybe the root cause of this bug and Bug 521026 is the same.
Bug 521026 mentions a similar issue with Thunderbird (with and without Lightning). The F8 key only works after opening the View menu once.
Maybe the root cause of this bug and Bug 521026 is the same.