reallygoodemails.com - Empty right side split screen view

[webcompat-bot]

URL: https://reallygoodemails.com/emails/meet-chalet-our-latest-limited-edition-collection-/live/

Browser / Version: Firefox (Developer Edition) 79.0b3
Operating System: Mac OS X 10.15
Tested Another Browser: Yes Chrome

Problem type: Something else
Description: In the live view split screen (code/design) feature, the design is not visible in Firefox Developer Edition
Steps to Reproduce:
https://reallygoodemails.com offer a split screen live code editor feature for the featured email designs. The code editor is displayed on the left half of the browser window, the resulting design is displayed on the right (tested with Chrome) In Firefox, the right half is blank.

View the screenshot

Browser Configuration

• gfx.webrender.all: false
• gfx.webrender.blob-images: true
• gfx.webrender.enabled: false
• image.mem.shared: true
• buildID: 20200703001609
• channel: aurora
• hasTouchScreen: false
• mixed active content blocked: false
• mixed passive content blocked: false
• tracking content blocked: false

View console log messages

From webcompat.com with ❤️

[softvision-oana-arbuzov]

Thanks for the report, I was able to reproduce the issue.

Note:

1. The issue is not reproducible on Chrome.
2. The issue is reproducible on Firefox regardless if ETP is enabled or not.

Tested with:
Browser / Version: Firefox Nightly 80.0a1 (2020-07-05)
Operating System: Windows 10 Pro

Moving to Needsdiagnosis for further investigation.

[ksy36]

Here html code from the editor on the left is inserted to the iframe on the right of the screen with this code:

Object(c.useEffect) (function () {
r.current && (r.current.contentDocument.documentElement.innerHTML = l)
},

But the iframe stays empty in Firefox. If I try to edit the code on the left, the template loads (so the problem is with initial page load). This is a duplicate of https://bugzilla.mozilla.org/show_bug.cgi?id=695868

[ksy36]

Thinking maybe we could look into adding an intervention since this site is quite popular