I don’t imagine a like-for-like successor to Zombie Keys, but can anyone suggest extensions – for Chromium, or Firefox – that might be enhanced to work with modernised Thunderbird?
I identified three potential candidates:
Source code is available.
For it to work with Thunderbird, it should, I guess, first work with Firefox 95.0.2 (it does not; I sent an e-mail to the developer).
The wish for an extension was more for someone else, than for me. That person seemed more interested in complaining than in any solution, so I removed (from a forum elsewhere) what was previously a cross-reference to this topic.
Still, it will be nice to have an extension.
For myself: years ago I enjoyed the Mac OS X approach to keystrokes for character composition.
When I switched to FreeBSD, I missed the predictability of Apple’s approach.
After I taught myself to use Unicode composition for the non-keyboard characters that I most often use, I made the decision to not learn use of the compose key.
U+2013 for – an en dash, U+2026 for … an ellipsis, and so on.
More specifically: Control-Shift-U
For less memorable compositions, I use KCharSelect:
