manifest.json

{
  // Required
  "manifest_version": 2,
  "name": "2020",
  "version": "0.1",
  "description": "Every 20 minutes alert user and force them to avert their eyes",
  "permissions": ["alarms", "declarativeContent", "storage", "activeTab"],
  "background": {
    "scripts": ["helper.js", "background.js"],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": ["*://*/*"],
      "js": ["./content.js"]
    }
  ],
  "page_action": {
    "default_popup": "popup.html"
    // add default icons and icons
  }
}




// Recommended
// "action": {
  //   "default_icon": {           
    //     "16": "images/icon16.png",
    //     "24": "images/icon24.png",
    //     "32": "images/icon32.png" 
    //   },
    //   "default_title": "Click Me",   // optional, shown in tooltip
    //   "default_popup": "popup.html"  // optional
    // },
    // "default_locale": "en",
    // "description": "A plain text description",
    // "icons": {...},
    
    //   // Optional
    //   "author": ...,
    //   "automation": ...,
    //   "background": {
      //     // Required
      //     "service_worker": "background.js",
      //     // Optional
      //     "type": ...
      //   },
      //   "chrome_settings_overrides": {...},
      //   "chrome_url_overrides": {...},
      //   "commands": {...},
      //   "content_capabilities": ...,
      //   "content_scripts": [{...}],
      //   "content_security_policy": {...},
      //   "converted_from_user_script": ...,
      //   "cross_origin_embedder_policy": {"value": "require-corp"},
      //   "cross_origin_opener_policy": {"value": "same-origin"},
      //   "current_locale": ...,
      //   "declarative_net_request": ...,
      //   "devtools_page": "devtools.html",
      //   "differential_fingerprint": ...,
      //   "event_rules": [{...}],
      //   "externally_connectable": {
        //     "matches": ["*://*.example.com/*"]
        //   },
        //   "file_browser_handlers": [...],
        //   "file_system_provider_capabilities": {
          //     "configurable": true,
          //     "multiple_mounts": true,
          //     "source": "network"
          //   },
          //   "homepage_url": "https://path/to/homepage",
          //   "host_permissions": [...],
          //   "import": [{"id": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"}],
          //   "incognito": "spanning, split, or not_allowed",
          //   "input_components": ...,
          //   "key": "publicKey",
          //   "minimum_chrome_version": "versionString",
          //   "nacl_modules": [...],
          //   "natively_connectable": ...,
          //   "oauth2": ...,
          //   "offline_enabled": true,
          //   "omnibox": {
            //     "keyword": "aString"
            //   },
            //   "optional_permissions": ["tabs"],
            //   "options_page": "options.html",
            //   "options_ui": {
              //     "page": "options.html"
              //   },
              //   "permissions": ["tabs"],
              //   "platforms": ...,
              //   "replacement_web_app": ...,
              //   "requirements": {...},
              //   "sandbox": [...],
              //   "short_name": "Short Name",
              //   "storage": {
                //     "managed_schema": "schema.json"
                //   },
                //   "system_indicator": ...,
                //   "tts_engine": {...},
                //   "update_url": "https://path/to/updateInfo.xml",
                //   "version_name": "aString",
                //   "web_accessible_resources": [...]