Examine source code of RosterBlur: Blur Student Names on Screen

{
  "manifest_version": 3,
  "name": "RosterBlur: Blur Student Names on Screen",
  "short_name": "RosterBlur",
  "version": "2.0.4",
  "description": "Blur student names before you share your screen. Click to blur anything, auto-blur whole rosters. 100 percent local and private.",
  "browser_specific_settings": {
    "gecko": {
      "id": "rosterblur@rosterblur-pro.netlify.app",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "scripting",
    "alarms"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "shared.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "shared.js",
        "contentScript.js"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "match_about_blank": true
    },
    {
      "matches": [
        "https://rosterblur-pro.netlify.app/activate*"
      ],
      "js": [
        "activate.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "RosterBlur",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "commands": {
    "toggle-picker": {
      "suggested_key": {
        "default": "Alt+Shift+B"
      },
      "description": "Toggle the click-to-blur picker"
    },
    "panic-blur": {
      "suggested_key": {
        "default": "Alt+Shift+H"
      },
      "description": "Panic: blur the entire page"
    },
    "toggle-shield": {
      "suggested_key": {
        "default": "Alt+Shift+S"
      },
      "description": "Toggle the presentation shield (roster blur + tab masks)"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'none'"
  }
}