Examine source code of Blur. The Image and Video blur extension

{
  "browser_specific_settings": {
    "gecko": {
      "id": "{d3b1b8be-d88e-42e6-9aa5-3c3e7030a634}",
      "strict_min_version": "109.0"
    }
  },
  "name": "Blur. The Image and Video blur extension",
  "version": "6.0.3",
  "description": "A browser extension that blurs all images on a page, for when you want to be discreet or don't want to look at certain images.",
  "manifest_version": 3,
  "permissions": [
    "storage",
    "activeTab"
  ],
  "content_scripts": [
    {
      "run_at": "document_start",
      "all_frames": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "constants.js",
        "browser-compat.js",
        "filter.js"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "128": "logo/icon-black-128.png"
    },
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "logo/icon-black-128.png"
  },
  "commands": {
    "reverse_status": {
      "suggested_key": {
        "default": "Alt+L"
      },
      "description": "Reverse blur state"
    },
    "toggle_selected": {
      "suggested_key": {
        "default": "Alt+K"
      },
      "description": "Unblur/reblur selected image"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}