Make Zombiekeys compatible with Thunderbird 91 and later

[RealRaven2000]

The main mechanism of getting the key listener to work with the UI are XBL bindings - these need to obviously be replaced.

Within Composer it would interesting to run the code from a content script - John Bieling gave a minimal example - see attached zip file.
_contentScripts.zip

[ovari]

@jobisoft can you please provide more help with porting Zombie Keys (Multilanguage Keyboard) to Thunderbird 78? Thank you

[eagerm]

I'll take a look at the code to see if there is anything I can help with.
-- Michael Eager (eager@eagercon.com)

[RealRaven2000]

Finally working on this in earnest, getting some assistance from @jobisoft.

I have started with writing a ComposeScript (so we can only run in composer at the moment), It reads the legacy preferences but there is no options UI at the moment.

zombie_keys_multilanguage_keyboard-3.0pre9.zip

I want to move the logic into a ESR6 module eventually so that I can call it from anywhere with a simple event listener easily, after that I would like to add it to selected elements in the THunderbird UI (let's start with the subject line in composer). Ideally I would like it to work in all search windows as well.

If I can manage it I also want to create a pure web extension without any experimental APIs that can be used to edit text within a Firefox window.