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Blocks SDK / Interface extensions SDK - Issue on Chrome when developing locally

  • October 30, 2025
  • 2 replies
  • 53 views
W
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Hi! I get a “Connection error. Please check if your local block is running.” when running the extension I created locally. It works on Firefox. This was working previously. Initially, I thought it was related to a Windows 11 update that broke development with localhost, but I rolled it back, and it works on Firefox…

I’m using the latest build as I plan on using the new multi table feature (I’m currently using the Web API to query a second table).

dominik

2 replies

Taha-Jiruwala
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If it’s working on Firefox, it should normally work on Chrome as well since the block runs locally through localhost during development. So there shouldn’t be a browser-specific issue.

Make sure you’re running block run before testing so the extension is active locally.

If the issue persists, could you share a few screenshots of what you’re seeing? That’ll help me understand what’s happening.
 

Taha, Views And Bases

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  • WGomes
  • Author
  • New Participant
  • November 2, 2025

Yes, I’m running block run, otherwise, it would not work on Firefox. Looking at the browser console, I noticed some CORS errors when trying to get data from localhost.

I then ran Chrome from the command line using the command below (I’m on Windows), and it worked. It seems that the newer version is enforcing CORS? Am I missing something? Looks like Firefox is more lenient?

"C:\Program Files\Google\Chrome\Application\chrome.exe" --disable-web-security --user-data-dir=C:\chrome-dev-data

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