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由 Firefox 用户 9d0c60 发表于 Dec. 3, 2020 · 永久链接

Very useful add-on, I would say essential, extremely simple to use but filling an important gap of Thunderbird new versions . I have just installed it and tested on Thunderbird 78.5.1. x64 with Windows 10 20H2. It makes the highlighted text well visible also when receiving the email on my phone (Android 10 - Outlook and Gmail).
I saw no specific command to cancel an highlighting done; just an 'undo' however does the job.