Key bindings are active in options window

[piterq]

Key bindings are active in options window.
Because of this it's impossible to type "j" character in account configuration if you set this:
{"j": "unset"}
in main key bindings.

[wshanks]

I can't reproduce this. Can you give more details about your set up and say which text box is not allowing "j" to be typed?

[piterq]

Thunderbird 78.5.0 x64.

Add-on configuration:

In this case I can't use "j" key here:

[wshanks]

Okay, that I can reproduce. The signature box must have a special class. tbkeys allows keys through when it detects that the focused element is a text field but to do this it compares against a set list of tags and properties.