We already have it as a non-XUL extension, so I don't see what your issue with it is? Just that it is not built it?
https://addons.mozilla.org/firefox/addon/firefox-translations/
You can already install the extension and use it today. Also AFAIK the XUL extension was not local only translation
The existence of that ethnostate was built on the nakba and the continued subjugation of Palestinians and their Jewish allies.
Want an ethnostate? Go take it from Germany. God knows they deserve it at least.
Zionism requires the wiping of a culture and people to replace it with another. There is no form of Zionism which is not genocidal.