Rated 5 out of 5 stars

bởi Alexander Ihrig vào Tháng 9. 14, 2020 · liên kết thường trực

Really perfect re-implementation of this missing/removed feature in Thunderbird 78 using the collapsed="true" attribute. And the best is, that it supports other extensions, which add buttons to the toolbar (like my "Allow HTML Temp" addon).