fix bug 10255. Hide overflow to fix RTL issues /ar/firefox/developer/ #10583
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Description
This PR fixes a RTL issue /ar/firefox/developer/ at small viewport sizes where the imagery would breaks out of the viewport causing horizontal scroll on the page.
Example: https://www.mozilla.org/ar/firefox/developer/
Issue / Bugzilla link
Fixes #10255
Testing
I tested it on my computer by running bedrock via Docker.