Examine source code of Save to Currents

{
  "manifest_version": 3,
  "name": "Save to Currents",
  "description": "Save images to Currents",
  "version": "1.2.0",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage",
    "cookies"
  ],
  "host_permissions": [
    "<all_urls>",
    "https://currents.is/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "fonts/*",
        "icon/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    },
    {
      "resources": [
        "content-scripts/clipper.css"
      ],
      "use_dynamic_url": true,
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@currents.is",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "/icon/16.png",
      "32": "/icon/32.png",
      "48": "/icon/48.png",
      "128": "/icon/128.png"
    },
    "default_title": "Save to Currents",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/clipper.js"
      ]
    }
  ]
}