Run Custom JS on Background
Always run custom JavaScript.
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Free
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About
・Runs custom JavaScript code continuously in Safari
・Supports a wide range of functions, including automatic bookmarklet execution, ad blocking, and automation.
・Easily paste code using the Paste button
・Supports import and export. You can instantly transfer your settings to other devices.
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What's New in Run Custom JS on Background
1.1
April 27, 2026
We have implemented import and export functionality. You can now instantly transfer codes registered on other devices.
