Examine source code of ZeroBlur

{
  "manifest_version": 2,
  "name": "ZeroBlur",
  "short_name": "ZeroBlur",
  "description": "Blur any sensitive information from any website or web app. Keep data safe when delivering demos or recording videos!",
  "version": "1.2.0",
  "author": "DivByZero",
  "browser_action": {
    "default_title": "ZeroBlur",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "./static/logo/16.png",
      "32": "./static/logo/32.png",
      "48": "./static/logo/48.png",
      "128": "./static/logo/128.png"
    },
    "browser_style": true
  },
  "icons": {
    "16": "./static/logo/16.png",
    "32": "./static/logo/32.png",
    "48": "./static/logo/48.png",
    "128": "./static/logo/128.png"
  },
  "content_scripts": [
    {
      "js": [
        "blur-manager.js"
      ],
      "css": [
        "blur-manager.css"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "toggleEditMode": {
      "description": "Toggles editing of blur on current page.",
      "suggested_key": {
        "default": "Alt+Shift+1"
      }
    },
    "togglePointToElement": {
      "description": "Toggles blurring of page element.",
      "suggested_key": {
        "default": "Alt+Shift+2"
      }
    },
    "togglePointToArea": {
      "description": "Toggles blurring of arbitrary area.",
      "suggested_key": {
        "default": "Alt+Shift+3"
      }
    },
    "toggleDocumentTitleBlur": {
      "description": "Toggles blurring of document title and favicon.",
      "suggested_key": {
        "default": "Alt+Shift+4"
      }
    }
  },
  "web_accessible_resources": [
    "*.ico"
  ],
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "content_security_policy": "default-src 'self'; style-src 'self' 'unsafe-inline';",
  "browser_specific_settings": {
    "gecko": {
      "id": "zero-blur@zero-blur",
      "strict_min_version": "80.0"
    }
  }
}