"manifest_version": 2,
 "name": "Calculadora de Horas",
 "version": "1.0",
 "description": "Calculate work hours easily with this tool.",
 "icons": {
   "48": "icons/icon48.png",
   "128": "icons/icon128.png"
 },
 "browser_action": {
   "default_popup": "popup.html"
 },
 "permissions": ["tabs"]

Hi everyone, I'm trying to upload a Firefox extension I built for my tool [https://calculadoradehoras.io https://calculadoradehoras.io ](an online calculator for work hours), but I’m stuck on the submission step. I zipped the extension and uploaded it via addons.mozilla.org, but I get this error: “Signing is not possible due to an error with the manifest file” I double-checked manifest.json and everything seems fine. Here’s a snippet: { "manifest_version": 2, "name": "Calculadora de Horas", "version": "1.0", "description": "Calculate work hours easily with this tool.", "icons": { "48": "icons/icon48.png", "128": "icons/icon128.png" }, "browser_action": { "default_popup": "popup.html" }, "permissions": ["tabs"] } I also tried switching to manifest_version: 3, but then Firefox Focus doesn't seem to recognize it properly. Has anyone faced this issue while uploading extensions to AMO? Is there a specific guideline or manifest structure Firefox Focus requires? Any help would be really appreciated. Jhonn Marie