ExtensionLoadWarning for React Devtools

I’m using https://github.com/electron/electron-quick-start.

I installed electron-devtools-installer and wired it up as per the README: https://github.com/MarshallOfSound/electron-devtools-installer#usage.

When I run the Electron app, I get the following message in the console, and React Devtools never loads in the app/browser.

(node:67218) ExtensionLoadWarning: Warnings loading extension at /Users/tysonnero/Library/Application Support/electron-quick-start/extensions/fmkadmapgofadopljbjfkapdkoienihi: Unrecognized manifest key 'browser_action'. Unrecognized manifest key 'minimum_chrome_version'. Unrecognized manifest key 'update_url'. Cannot load extension with file or directory name _metadata. Filenames starting with "_" are reserved for use by the system. 
Added Extension:  React Developer Tools

"electron": "^9.1.1",
"electron-devtools-installer": "^3.1.1"

[ethankale]

Same issue, also same electron and electron-devtools-installer version, trying to load VUEJS-DEVTOOLS.

[Coding-Kiwi]

For me it was the fact that I was using the file:// protocol, this can be worked around by using allowFileAccess

installExtension(VUEJS3_DEVTOOLS, {
    loadExtensionOptions: {
        allowFileAccess: true,
    },
})

The warning still stays, but the devtools work!

I fiddled around with loading the extension manually. I copied the extension folder from my chrome userdata folder and loaded it like this:

import { session } from 'electron';

let ext_path = path.resolve(".", "extensions", "vue-devtools");
await session.defaultSession.loadExtension(ext_path, {
    allowFileAccess: true
});

I modified the manifest.json inside the extension folder (deleted the browser_action, update_url keys, the "contextMenus" entry in permissions) and deleted the _metadata directory.

This resolves the ExtensionLoadWarning and the devtools still work, but as it is said everywhere the warning has nothing to do with the extension not working, the main issue is most propably allowFileAccess