构建一个广告拦截器

{
  "manifest_version": 3,
  "name": "My Ad Blocker",
  "version": "1.0.0",
  "permissions": ["declarativeNetRequest"],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ads",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "background": {
    "service_worker": "background.js"
  },
  "action": {
    "default_title": "My Ad Blocker"
  }
}

[
  {
    "id": 1,
    "priority": 1,
    "action": { "type": "block" },
    "condition": {
      "urlFilter": "||ads.example.com^",
      "resourceTypes": ["script", "image", "sub_frame", "xmlhttprequest"]
    }
  },
  {
    "id": 2,
    "priority": 1,
    "action": { "type": "block" },
    "condition": {
      "urlFilter": "||tracker.example.net^",
      "resourceTypes": ["script", "xmlhttprequest"]
    }
  }
]

{
  "id": 3,
  "priority": 1,
  "action": { "type": "block" },
  "condition": {
    "urlFilter": "||blocked.example.com^",
    "resourceTypes": ["main_frame"]
  }
}

{
  "id": 4,
  "priority": 1,
  "action": {
    "type": "redirect",
    "redirect": { "extensionPath": "/blocked.html" }
  },
  "condition": {
    "urlFilter": "||blocked.example.com^",
    "resourceTypes": ["main_frame"]
  }
}

{
  "permissions": ["declarativeNetRequest"],
  "host_permissions": ["*://blocked.example.com/*"],
  "firefox:permissions": ["declarativeNetRequest", "*://blocked.example.com/*"],
  "firefox:web_accessible_resources": ["blocked.html"]
}

async function blockDomain(domain, ruleId) {
  await chrome.declarativeNetRequest.updateDynamicRules({
    removeRuleIds: [ruleId],
    addRules: [
      {
        id: ruleId,
        priority: 1,
        action: { type: 'block' },
        condition: {
          urlFilter: `||${domain}^`,
          resourceTypes: ['script', 'image', 'xmlhttprequest']
        }
      }
    ]
  })
}

chrome.runtime.onInstalled.addListener(() => {
  blockDomain('annoying-banners.example', 1001)
})

chrome.declarativeNetRequest.setExtensionActionOptions({
  displayActionCountAsBadgeText: true
})