Examine source code of kp2md

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "2019.1114.108",
  "default_locale": "en",
  "icons": {
    "16": "./icons/kp2md-16.png",
    "24": "./icons/kp2md-24.png",
    "32": "./icons/kp2md-32.png",
    "48": "./icons/kp2md-48.png",
    "64": "./icons/kp2md-64.png",
    "128": "./icons/kp2md-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "default_icon": {
      "16": "./icons/kp2md-16.png",
      "24": "./icons/kp2md-24.png",
      "32": "./icons/kp2md-32.png",
      "48": "./icons/kp2md-48.png",
      "64": "./icons/kp2md-64.png",
      "128": "./icons/kp2md-128.png"
    },
    "default_title": "__MSG_extensionName__",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": {
      "16": "./icons/kp2md-16.png",
      "24": "./icons/kp2md-24.png",
      "32": "./icons/kp2md-32.png",
      "48": "./icons/kp2md-48.png",
      "64": "./icons/kp2md-64.png",
      "128": "./icons/kp2md-128.png"
    },
    "default_title": "__MSG_extensionName__",
    "browser_style": true
  },
  "permissions": [
    "https://keep.google.com/",
    "activeTab",
    "tabs"
  ]
}