Last verified 2026-07-15
shopify theme app extension breaks add to cart
Theme app extensions that flash then vanish kill trust on paid landers. Reproduce on mobile, then disable the last installed extension.
The actual problem
A theme app extension JS error blocks ATC on mobile after a routine app update.
Do this
- Console-check ATC on mobile after every app update.
- Disable newest theme extensions until ATC works.
- Pin working app versions during paid campaigns.
- Keep a known-good theme preset to roll back.
Tools for this job
- Tillkiln
Storefront/checkout trap detection
Scan the live storefront for stacking, OOS-buyable, and dead links before you blame ads → tillkiln.com.
- Cashkiln checklist
Pre-ads operator checks
Start with the free operator checks → cashkiln.com/leaks.
Related intents
Scan the store before more ad spend
Tillkiln finds checkout and storefront leaks — stacking discounts, OOS still buyable, dead collection links — with a rough $ leak estimate.
Also from Cashkiln
- Tillkiln — scan checkout leaks before you buy more ads
- Netkiln sample — client-ready revenue-health page from a payouts CSV ($19 clean unlock)
- Free leak checklist — six operator checks
Deep-dive report — $29
Self-serve checklist expansion for this query family. PayPal Checkout. No call.