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Easy methods to Get Extension Manifest Data

Engaged on an internet extension may be kinda wild — on one facet you are basically simply coding a web site, on the opposite facet you are restricted to what the browser says you are able to do within the extension execution atmosphere. One change in that atmosphere is coming January 2023 — pushing extensions to maneuver to manifest model 3. I just lately obtained interested in whether or not different widespread extensions had accomplished the model 3 replace.

Executing the next command within the background web page (manifest model 2) or service employee (model 3) will present you the extension’s manifest:


The getManifest name returns a big object detailing the extension’s manifest. This is what you’d see for the MetaMask browser extension:

    "creator": "https://metamask.io",
    "background": {
        "web page": "background.html",
        "persistent": true
    "browser_action": {
        "default_icon": {
            "16": "photos/icon-16.png",
            "19": "photos/icon-19.png",
            "32": "photos/icon-32.png",
            "38": "photos/icon-38.png",
            "64": "photos/icon-64.png",
        "default_popup": "popup.html",
        "default_title": "MetaMask"
    "instructions": {
        "_execute_browser_action": {
            "suggested_key": {
                "chromeos": "Alt+Shift+M",
                "linux": "Alt+Shift+M",
                "mac": "Alt+Shift+M",
                "home windows": "Alt+Shift+M"
    "content_scripts": [
            "all_frames": true,
            "js": [
            "matches": [
            "run_at": "document_start"
    "current_locale": "en_US",
    "default_locale": "en",
    "description": "An Ethereum Pockets in your Browser",
    "externally_connectable": {
        "ids": [
        "matches": [
    "icons": {
        "16": "photos/icon-16.png",
        "19": "photos/icon-19.png",
        "32": "photos/icon-32.png",
        "38": "photos/icon-38.png",
        "48": "photos/icon-48.png",
        "64": "photos/icon-64.png",
    "manifest_version": 2,
    "minimum_chrome_version": "66",
    "title": "MetaMask",
    "permissions": [
    "short_name": "MetaMask",
    "update_url": "https://clients2.google.com/service/update2/crx",
    "model": "10.16.1"

Lots of internet extensions are nonetheless utilizing manifest model 2, so many extension builders are pushing to complete manifest model 3 work!



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