They get killed after 60 seconds of inactivity

    const browser = await pup.launch({
        headless: `new`,
        defaultViewport: { width: 1920, height: 1080 },
    })

    const getPageSnapshot = (url, fullPage) => new Promise(async (resolve, reject) => { // this returns a promise resolving to a buffer
        const page = await browser.newPage().catch(reject)
        await page.goto(url).catch(reject)

        resolve(await page.screenshot({
            fullPage
        }).then(async (r) => { await page.close(); return r }).catch(reject))
    })

    const browser = await pup.launch({
        headless: `new`,
        defaultViewport: { width: 1920, height: 1080 },
    })

    const getPageSnapshot = (url, fullPage) => new Promise(async (resolve, reject) => { // this returns a promise resolving to a buffer
        const page = await browser.newPage().catch(reject)
        await page.goto(url).catch(reject)

        resolve(await page.screenshot({
            fullPage
        }).then(async (r) => { await page.close(); return r }).catch(reject))
    })

    async handle(
        request: Request,
        env: any,
        context: any,
        data: Record<string, any>
    ) : Promise<Response> {
                // some url handling
        
        const browser = await puppeteer.launch(env.MYBROWSER);
        const page = await browser.newPage();
        await page.setViewport({ width: 1920, height: 1080 })
        await page.goto(url);
        const screenshot = (await page.screenshot({
            fullPage: false,
        })) as Buffer;
        await browser.close();

        return new Response(screenshot, {
            headers: {
                'Content-Type': `image/jpeg`,
            },
        });
    }

    async handle(
        request: Request,
        env: any,
        context: any,
        data: Record<string, any>
    ) : Promise<Response> {
                // some url handling
        
        const browser = await puppeteer.launch(env.MYBROWSER);
        const page = await browser.newPage();
        await page.setViewport({ width: 1920, height: 1080 })
        await page.goto(url);
        const screenshot = (await page.screenshot({
            fullPage: false,
        })) as Buffer;
        await browser.close();

        return new Response(screenshot, {
            headers: {
                'Content-Type': `image/jpeg`,
            },
        });
    }

        await page.goto(url, {
            waitUntil: `load`
        });

        await page.goto(url, {
            waitUntil: `load`
        });

  {
      "message": [
        "Browser DO: Could not start browser instance. Error: Error: Unabled to create new browser: code: 429: message: Too Many Requests",
        "Error: Unabled to create new browser: code: 429: message: Too Many Requests\n    at PuppeteerWorkers.launch (index.js:19201:13)\n    at async Browser2.fetch (index.js:43967:24)"
      ],
      "level": "error",
      "timestamp": 1702366528655
    }

  {
      "message": [
        "Browser DO: Could not start browser instance. Error: Error: Unabled to create new browser: code: 429: message: Too Many Requests",
        "Error: Unabled to create new browser: code: 429: message: Too Many Requests\n    at PuppeteerWorkers.launch (index.js:19201:13)\n    at async Browser2.fetch (index.js:43967:24)"
      ],
      "level": "error",
      "timestamp": 1702366528655
    }

  async fetch(url: string) {
    //if there's a browser session open, re-use it
    if (!this.browser || !this.browser.isConnected()) {
      console.log(`Browser DO: Starting new instance`);
      try {
        this.browser = await puppeteer.launch(this.env.CHROMIUM);
      } catch (e) {
        console.error(
          `Browser DO: Could not start browser instance. Error: ${e}`,
          e.stack
        );
        throw e;
      }
    }
   .......
  }

  async fetch(url: string) {
    //if there's a browser session open, re-use it
    if (!this.browser || !this.browser.isConnected()) {
      console.log(`Browser DO: Starting new instance`);
      try {
        this.browser = await puppeteer.launch(this.env.CHROMIUM);
      } catch (e) {
        console.error(
          `Browser DO: Could not start browser instance. Error: ${e}`,
          e.stack
        );
        throw e;
      }
    }
   .......
  }

 async alarm() {
    this.keptAliveInSeconds += 10;

    // Extend browser DO life
    if (this.keptAliveInSeconds < KEEP_BROWSER_ALIVE_IN_SECONDS) {
      console.log(
        `Browser DO: has been kept alive for ${this.keptAliveInSeconds} seconds. Extending lifespan.`
      );
      await this.storage.setAlarm(Date.now() + 10 * 1000);
      await this.browser.version();
    } else
      console.log(
        `Browser DO: exceeded life of ${KEEP_BROWSER_ALIVE_IN_SECONDS}. Browser DO will be shut down in 10 seconds.`
      );
  }

 async alarm() {
    this.keptAliveInSeconds += 10;

    // Extend browser DO life
    if (this.keptAliveInSeconds < KEEP_BROWSER_ALIVE_IN_SECONDS) {
      console.log(
        `Browser DO: has been kept alive for ${this.keptAliveInSeconds} seconds. Extending lifespan.`
      );
      await this.storage.setAlarm(Date.now() + 10 * 1000);
      await this.browser.version();
    } else
      console.log(
        `Browser DO: exceeded life of ${KEEP_BROWSER_ALIVE_IN_SECONDS}. Browser DO will be shut down in 10 seconds.`
      );
  }