Wildmonkey

Typically, you can execute custom JavaScript code in the browser's DevTools > Console. This extension implements functionality missing from browsers, to save custom JavaScript code that can: * Automatically execute when the page loads. * Manually execute with a button click. This extension also supports CSS code, which is internally converted to JavaScript code for execution. This extension is not a replacement for Greasemonkey, so it doesn't support Greasemonkey-specific code.