v91.2

What's Changed

This release addresses Thunderbird 91 ESR.

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Changed

• Prefer "HTML" literal (uppercased) when used in documentation
• Improve permissions.memory_only preference documentation (see #23)
• Move (and reset) mail.tabs.autoHide from 9110 to 9000 (personal section) (see #21 and #25)

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Thanks to @demided (@ghost) and @jakeafoster for their time !