Sites forced into mobile layout and broken
Sites like YouTube Music, Pinterest and Temu switch to mobile layout or break when the side view add-on is installed.
Tier I · Proven The best-established problems.
15 public reports · first reported 28 May 2019 · last reported 27 March 2026
What's going wrong
Firefox users who install Side View report that some websites, most often YouTube Music, Pinterest and Temu, start rendering in a phone layout in the main window even when the side panel is closed.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 15 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.