Examine source code of histre

{
  "background": {
    "page": "background.html"
  },
  "action": {
    "default_icon": {
      "16": "assets/img/icon-16.png",
      "48": "assets/img/icon-48.png",
      "128": "assets/img/icon-128.png"
    },
    "default_popup": "apps/popup/popup.html",
    "default_title": "histre"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  },
  "chrome_url_overrides": {},
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+H",
        "mac": "MacCtrl+Shift+H"
      }
    }
  },
  "description": "Supercharge your browsing - Smart bookmarks with annotations, history, and sharing",
  "icons": {
    "16": "assets/img/icon-16.png",
    "48": "assets/img/icon-48.png",
    "128": "assets/img/icon-128.png"
  },
  "host_permissions": [
    "*://*/*",
    "https://histre.com/"
  ],
  "manifest_version": 3,
  "name": "histre",
  "optional_permissions": [
    "bookmarks",
    "history"
  ],
  "options_ui": {
    "open_in_tab": true,
    "page": "pages/options/options.html"
  },
  "permissions": [
    "contextMenus",
    "webNavigation",
    "tabs",
    "storage",
    "scripting"
  ],
  "short_name": "histre",
  "sidebar_action": {
    "default_icon": {
      "16": "assets/img/icon-16.png",
      "48": "assets/img/icon-48.png",
      "128": "assets/img/icon-128.png"
    },
    "default_title": "histre",
    "default_panel": "apps/sidebar/sidebar.html",
    "open_at_install": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a958f148-254f-4b38-b2e6-1b988a227763}"
    }
  },
  "version": "3.20.1",
  "web_accessible_resources": [
    {
      "resources": [
        "apps/**/*.css",
        "apps/*/assets/*",
        "assets/img/**/*",
        "assets/theme/fonts/cerebrisans/cerebrisans-regular.woff"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ]
}