Sign adapted extant extension

Hello. There is an extension ‘transliteration’ (https://addons.mozilla.org/en-US/firefox/addon/trans-literate/). The request is to modify to use with own glyphs, added to the directory for a new extension.

How to get the META-INF directory added to the archive of the new extension, with correct signature? Want to test before distribution.

Directory structure of new extension is below. The original directory ‘meta-inf’ was deleted because it looked to contain signature files unique to the original extension ‘transliterate’

"
customfont.ttf
glyphs/
manifest.json
testing: selector.html
testing: selector.js
testing: transliterate.js
"

The file ‘transliterate.js’ was edited to:

"

var transliterations = {latin:{nameofcustomfont:{p: “𐑐”,
‘a’: ‘glyphs/exampleglyphofcustomfont.svg’},

"

File ‘selector.html’ was edited to:

"

name of custom font

"

File ‘manifest.json’ was edited to:

"

“web_accessible_resources”: [“nameofcustomfont.ttf”]

"

Thank you.