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Firefox: Taking a screenshot with omitBackground fails [Emulation.setDefaultBackgroundColorOverride not implemented]

See original GitHub issue

Steps to reproduce

Tell us about your environment:

Puppeteer version: 3.0.0
Platform / OS version: Linux Debian unstable
URLs (if applicable):
Node.js version: v12.16.2

What steps will reproduce the problem?

var firefox = (await puppeteer.launch({
    product: 'firefox',
    executablePath: '/opt/firefox/firefox',
    headless: true,
    devtools: false,
    defaultViewport: {
      width: 1000,
      height: 0,
      deviceScaleFactor: 2
    }
  }));

page = (await firefox.pages())[0];
page.goto("https://github.com");

await page.screenshot({
    omitBackground: true,
    path: 'screenshot.png'
})

What is the expected result?

Just take a screenshot with transparent background.

What happens instead?

An error is logged in firefox console: Emulation.setDefaultBackgroundColorOverride

And in the terminal the following is logged:

Error: Protocol error (Emulation.setDefaultBackgroundColorOverride): Emulation.setDefaultBackgroundColorOverride RemoteAgentError@chrome://remote/content/Error.jsm:25:5
UnknownMethodError@chrome://remote/content/Error.jsm:108:7                                                                                                                                                                          
execute@chrome://remote/content/domains/DomainCache.jsm:96:13                                                                                                                                                                       
receiveMessage@chrome://remote/content/sessions/ContentProcessSession.jsm:69:45                                                                                                                                                     
MessageListener.receiveMessage*ContentProcessSession@chrome://remote/content/sessions/ContentProcessSession.jsm:27:25                                                                                                               
@chrome://remote/content/sessions/frame-script.js:12:1                                                                                                                                                                              

      at node_modules/puppeteer/lib/Connection.js:173:63                                                                                                                                             
      at new Promise (<anonymous>)                                                                                                                                                                                                  
      at CDPSession.send (node_modules/puppeteer/lib/Connection.js:172:16)                                                                                                                                                          
      at Page._screenshotTask (node_modules/puppeteer/lib/Page.js:860:32)                                                                                                                                                           
      at processTicksAndRejections (internal/process/task_queues.js:97:5)                                                                                                                                                           
    -- ASYNC --                                                                                                                                                                                                                     
      at Page.<anonymous> (node_modules/puppeteer/lib/helper.js:105:23)

Issue Analytics

State:
Created 3 years ago
Reactions:2
Comments:9 (1 by maintainers)

Top GitHub Comments

1reaction

michael-bradecommented, Jun 24, 2022

Well, it is still the case. However, the Firefox bug was closed due to low priority 😦

0reactions

drmrbrewercommented, Sep 16, 2022

@michael-brade ok thanks for letting me know… looks like this is a dealbreaker so far as using firefox is concerned 😦

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