Examine source code of Hypothes.is bookmarklet

{
  "description": "Unofficial. Serve Hypothes.is on any sites even under CSP.",
  "manifest_version": 2,
  "name": "Hypothes.is bookmarklet",
  "version": "1.1.3",
  "homepage_url": "https://github.com/Abdillah/hypothesis-firefox",
  "icons": {
    "48": "icons/hypothesis-48.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "page": "background.html"
  },
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "19": "icons/hypothesis-19.png",
      "38": "icons/hypothesis-38.png"
    },
    "default_title": "Show Hypothes.is",
    "pinned": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "hypothesis.js"
      ],
      "run_at": "document_end"
    }
  ]
}