XPI file appears to be corrupt, sideloading from a website download

 "manifest_version": 2,
 "name": "FireFoxExtension",
 "version": "1.0",

 "background":{
   "scripts":["background.js"]
 },

 "applications":{
   "gecko":{
     "id":"firefoxExtension"
   }
 },

 "content_scripts": [
   {
     "matches": ["*://*.mozilla.org/*"],
     "js": ["contentScript.js"]
   }
 ]

Following instructions from this website: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Developing_WebExtensions_for_Firefox_for_Android I've got the xpi file saved in my Androids download folder, when I click the file, firefox launchs and tells me the add on is unathorized, I then allow the install but get the error that the file appears to be corrupt... I'm pretty sure the manifest is written correctly, { "manifest_version": 2, "name": "FireFoxExtension", "version": "1.0", "background":{ "scripts":["background.js"] }, "applications":{ "gecko":{ "id":"firefoxExtension" } }, "content_scripts": [ { "matches": ["*://*.mozilla.org/*"], "js": ["contentScript.js"] } ] } I am using this simple shell script to zip the xpi file... sudo zip -r -FS ../fireExtension.xpi * any ideas?