Steps to Reproduce:

1. Navigate to https://eatsmarter.de/rezepte/saison/ostern/ostertorten in Firefox Preview Nightly with ETP Strict enabled
2. Observe the site

Expected Behavior:
The layout is displayed correctly

Actual Behavior:
The layout is broken

Not reproducible with Standard TP

I can reproduce this in strict mode in the responsive design mode emulating a Galaxy phone. If I allow this script to load, things are better:

https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js

I can also shim it with an empty script, so this is another case of a site expecting their ad-scripts to always load, and breaking if they don't.

Because this bug's Severity has not been changed from the default since it was filed, and it's Priority is P3 (Backlog,) indicating it has been triaged, the bug's Severity is being updated to S3 (normal.)

I can't reproduce the issue, with ETP - Strict the page layout is displayed correctly.
https://prnt.sc/z3dffb

Tested with:
Browser / Version: Firefox Nightly 210210 (🦎 87.0a1-20210209092956)
Operating System: Samsung Galaxy S8 (Android 9) - 1440 x 2960 pixels, 18.5:9 ratio (~570 ppi density),

Ads by Google shim was added in bug 1637329 and enabled in bug 1693386 for Firefox 87.