Tampermonkey

Tampermonkey 4.6

Free
Manage, update, install, and update user scripts from your browser.
 
4.6 (See all)

Tampermonkey is a free browser extension and a popular user script manager. It's available for Chrome, Microsoft Edge, Safari, Opera Next, and Firefox. It provides features like easy script installation, automatic update checks, a simple overview what scripts are running at a tab, a built-in editor and there is a good chance that incompatible scripts run fine with Tampermonkey.

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