Examine source code of Link Hints

{
  "manifest_version": 2,
  "version": "1.3.3",
  "name": "Link Hints",
  "author": "Simon Lydell",
  "description": "Click with your keyboard.",
  "homepage_url": "https://lydell.github.io/LinkHints",
  "browser_specific_settings": {
    "gecko": {
      "id": "linkhints@lydell.github.io"
    }
  },
  "icons": {
    "16": "icons/svg-$normal/16.svg",
    "32": "icons/svg-$normal/32.svg",
    "48": "icons/svg-$normal/48.svg",
    "64": "icons/svg-$normal/64.svg",
    "96": "icons/svg-$normal/96.svg",
    "128": "icons/svg-$normal/128.svg",
    "256": "icons/svg-$normal/256.svg"
  },
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "browser_action": {
    "browser_style": true,
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/svg-$normal/16.svg",
      "32": "icons/svg-$normal/32.svg",
      "48": "icons/svg-$normal/48.svg",
      "64": "icons/svg-$normal/64.svg",
      "96": "icons/svg-$normal/96.svg",
      "128": "icons/svg-$normal/128.svg",
      "256": "icons/svg-$normal/256.svg"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "match_about_blank": true,
      "run_at": "document_start",
      "js": [
        "worker.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "js": [
        "renderer.js"
      ]
    }
  ]
}