Firefox 隐私与安全

// 指纹防护技术实现示例
// 拦截 Canvas 指纹尝试

const originalGetContext = HTMLCanvasElement.prototype.getContext;

HTMLCanvasElement.prototype.getContext = function(type, attributes) {
  const context = originalGetContext.call(this, type, attributes);
  
  if (type === '2d' && context) {
    // 修改 Canvas API 行为以防止指纹收集
    const originalFillText = context.fillText;
    
    context.fillText = function(text, x, y, maxWidth) {
      // 添加轻微噪音以防止精确渲染识别
      const noise = Math.random() * 0.5 - 0.25;
      originalFillText.call(this, text, x + noise, y + noise, maxWidth);
    };
    
    // 标准化 Canvas 输出
    context.getImageData = function(sx, sy, sw, sh) {
      const imageData = CanvasRenderingContext2D.prototype.getImageData.call(
        this, sx, sy, sw, sh
      );
      // 添加轻微噪音到像素数据
      addNoiseToImageData(imageData);
      return imageData;
    };
  }
  
  return context;
};

// Firefox 同步加密实现示例

class FirefoxSyncEncryption {
  constructor() {
    this.crypto = window.crypto || window.msCrypto;
  }
  
  // 生成加密密钥
  async generateKey(password) {
    // 使用 PBKDF2 派生密钥
    const salt = this.crypto.getRandomValues(new Uint8Array(16));
    const baseKey = await this.crypto.subtle.importKey(
      'raw',
      new TextEncoder().encode(password),
      { name: 'PBKDF2' },
      false,
      ['deriveBits', 'deriveKey']
    );
    
    const key = await this.crypto.subtle.deriveKey(
      {
        name: 'PBKDF2',
        salt,
        iterations: 100000,
        hash: 'SHA-256'
      },
      baseKey,
      { name: 'AES-GCM', length: 256 },
      true,
      ['encrypt', 'decrypt']
    );
    
    return { key, salt };
  }
  
  // 加密数据
  async encryptData(key, data) {
    const iv = this.crypto.getRandomValues(new Uint8Array(12));
    const encodedData = new TextEncoder().encode(JSON.stringify(data));
    
    const encryptedData = await this.crypto.subtle.encrypt(
      {
        name: 'AES-GCM',
        iv
      },
      key,
      encodedData
    );
    
    return {
      iv: Array.from(iv),
      data: Array.from(new Uint8Array(encryptedData))
    };
  }
}

// 容器 API 使用示例

// 创建新容器
async function createContainer(name, color, icon) {
  try {
    const context = await browser.contextualIdentities.create({
      name,
      color,
      icon
    });
    
    console.log('容器已创建：', context);
    return context;
  } catch (error) {
    console.error('创建容器失败：', error);
  }
}

// 在新容器中打开标签页
async function openInContainer(url, containerId) {
  const tab = await browser.tabs.create({
    url,
    cookieStoreId: containerId
  });
  
  return tab;
}

// 查询特定容器的所有标签页
async function getContainerTabs(containerId) {
  const tabs = await browser.tabs.query({
    cookieStoreId: containerId
  });
  
  return tabs;
}