Examine source code of Hydrus Save

{
  "background": {
    "scripts": [
      "./src/background.mjs"
    ],
    "type": "module"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/16.png",
      "32": "icons/32.png"
    },
    "default_popup": "./src/popup.html",
    "default_title": "Hydrus Save",
    "theme_icons": [
      {
        "dark": "icons/16.png",
        "light": "icons/16-light.png",
        "size": 16
      },
      {
        "dark": "icons/32.png",
        "light": "icons/32-light.png",
        "size": 32
      },
      {
        "dark": "icons/48.png",
        "light": "icons/48-light.png",
        "size": 48
      },
      {
        "dark": "icons/128.png",
        "light": "icons/128-light.png",
        "size": 128
      }
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hydrus-save@relax.cat",
      "strict_min_version": "57.0"
    }
  },
  "commands": {
    "send-current-tab": {
      "description": "Send current tab to Hydrus",
      "suggested_key": {
        "default": "Alt+Shift+1"
      }
    }
  },
  "description": "Send links to Hydrus Network.",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "96": "icons/96.png",
    "128": "icons/128.png",
    "256": "icons/256.png"
  },
  "manifest_version": 2,
  "name": "Hydrus Save",
  "options_ui": {
    "browser_style": true,
    "page": "./src/options.html"
  },
  "permissions": [
    "contextMenus",
    "storage",
    "tabs",
    "notifications"
  ],
  "version": "69.4"
}