Why do you even create this Add-on? it is not working on Firefox at all.

I am using "Firefox 129.0.1 (64-bit)" in MacOS. Fix it / remove it from here.

toggle switch is not working properly.

lekhini web site has got some changes in typing methods
for some special characters & escaping transliteration.
looks like this extension doesn't has those changes ...

also it would be better to add a link in user interface
which popups the keyboard layout ...