I am having the same issue, but it’s only happening to my computer. I am not sure if I need to do something. 
Topic summary
Issue Identified:
Multiple users reported JavaScript code (specifically Boomerang performance monitoring script) displaying as visible text at the top of their websites. The problem appeared suddenly and affected only the users’ own computers, not other visitors to their sites.
Key Characteristics:
- Only visible on affected users’ local browsers (Chrome, Safari)
- Not a website code issue—other computers displayed sites normally
- Affected multiple Shopify websites when viewed from infected machines
Root Cause:
Spyware/adware application called “SurftoEarn” (also referenced as “surf2earn”) installed on users’ PCs without their knowledge.
Solution:
- Navigate to Windows Add/Remove Programs
- Search for and uninstall “SurftoEarn” application
- Clear browser cache and cookies (Chrome specifically mentioned)
Resolution:
Multiple users confirmed this solution immediately fixed the issue. The malware was difficult to detect—standard spyware scans failed to identify it, requiring manual removal through Windows program management.
Status: Resolved for all participants who removed the application.