Examine source code of Pick Commits

{
  "short_name": "Pick Commits",
  "name": "Pick Commits",
  "icons": {
    "16": "favicon.ico",
    "48": "logo192.png",
    "128": "logo512.png"
  },
  "start_url": ".",
  "display": "standalone",
  "theme_color": "#000000",
  "background_color": "#ffffff",
  "permissions": [
    "activeTab",
    "tabs",
    "contextMenus",
    "<all_urls>"
  ],
  "optional_permissions": [
    "<all_urls>",
    "tabs",
    "contextMenus"
  ],
  "manifest_version": 2,
  "version": "0.0.1",
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Pick Commits"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "./content.js"
      ],
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{52a51e6c-589f-48e4-b13f-765a34bf68be}"
    }
  }
}