I can confirm this issue with Thunderbird 60.2.1 and Ubuntu 18.04
Upstream bug is a duplicate of #616933 so changing
** Changed in: thunderbird (Ubuntu)
Status: Incomplete => Confirmed
** Bug watch added: Mozilla Bugzilla #616933
https://bugzilla.mozilla.org/show_bug.cgi?id=616933
** Changed in: thunderbird
Importance: Medium => Unknown
** Changed in: thunderbird
Status: Invalid => Unknown
** Changed in: thunderbird
Remote watch: Mozilla Bugzilla #737420 => Mozilla Bugzilla #616933
** Tags removed: precise
** Tags added: bionic
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https://bugs.launchpad.net/bugs/959823
Title:
text in the quickfilter toolbar disappear
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