Examine source code of Navigation

{
  "manifest_version": 2,
  "name": "Navigation",
  "author": "pdulvp@gmail.com",
  "version": "1.2resigned1",
  "homepage_url": "https://bitbucket.org/pdulvp/webext-navigation",
  "description": "It makes navigation accessible",
  "applications": {
    "gecko": {
      "id": "navigation@pdulvp",
      "strict_min_version": "60.0"
    }
  },
  "icons": {
    "32": "icons/navigation.svg",
    "48": "icons/navigation.svg"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/navigation.svg",
    "default_title": "Navigation",
    "default_popup": "ui/popup.html",
    "theme_icons": [
      {
        "light": "icons/navigation-dark.svg",
        "dark": "icons/navigation.svg",
        "size": 32
      },
      {
        "light": "icons/navigation-dark.svg",
        "dark": "icons/navigation.svg",
        "size": 16
      }
    ]
  },
  "sidebar_action": {
    "default_title": "Navigation",
    "default_panel": "ui/sidebar.html",
    "default_icon": "icons/navigation.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content_scripts/navigation.js"
      ]
    }
  ]
}