Examine source code of Better GitHub

{
  "manifest_version": 3,
  "name": "Better GitHub",
  "version": "0.0.18",
  "description": "Tweaks for GitHub.com",
  "host_permissions": [
    "*://github.com/*"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "action": {
    "default_icon": {
      "16": "icon16.png",
      "32": "icon48.png"
    },
    "default_popup": "popup/popup.html"
  },
  "commands": {
    "Expand All Hidden Items": {
      "suggested_key": {
        "default": "Ctrl+Shift+E",
        "mac": "Command+Shift+E"
      },
      "description": "Expand all hidden history items in issue. #path:^.*/issues/.*$"
    },
    "Hide All Commits From Issue": {
      "suggested_key": {
        "default": "Ctrl+Shift+H",
        "mac": "Command+Shift+H"
      },
      "description": "Hide all commit items in issue history. #path:^.*/issues/.*$"
    },
    "Generate List of Pending PRs": {
      "description": "Generate a list of pending PRs ahead of this PR. #path:^.*/pull/\\d+/commits/?$"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "js": [
        "lib.js",
        "pages/issues.js",
        "pages/prs.js",
        "index.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "options_ui": {
    "page": "options/options.html"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "better-github@windmuller.ca"
    }
  }
}