How to Use a Tampermonkey Script on a Website?

Jackson Gordon

Last update on: September 16, 2026

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If you frequently use the same website and wish it had a particular feature, a Tampermonkey script may help. Tampermonkey is a popular userscript manager that allows you to install and run custom JavaScript code on websites. These scripts can modify page layouts, automate repetitive actions, add new buttons or functions, and customize how certain websites behave.

However, using userscripts can be confusing if you are new to browser extensions or JavaScript. You may also encounter problems such as a script not appearing, failing to run, or working on one website but not another.

In this guide, we’ll explain what Tampermonkey is, whether it is safe, how to use a Tampermonkey script on a website, and how to troubleshoot common problems when Tampermonkey isn’t working.

1. What Is Tampermonkey?

Tampermonkey is a userscript manager available for popular browsers. It lets users install and manage small JavaScript programs called userscripts.

A userscript is designed to run automatically on specific websites and change or enhance their functionality. Depending on the script, it may:

Modify the appearance of a webpage
Add new buttons or controls
Automate repetitive tasks
Hide unwanted page elements
Change how information is displayed
Add shortcuts or additional functionality
Customize certain website features

For example, a userscript could add a button to a website that performs a repetitive action with one click.

Tampermonkey itself generally provides the environment for running these scripts rather than creating the functionality itself. The actual behavior depends on the JavaScript contained in each userscript.

2. Is Tampermonkey Safe?

Tampermonkey is widely used as a browser extension, but the safety of an individual userscript depends heavily on its source and code.

Unlike ordinary webpage content, a userscript can have significant access to the pages where it is configured to run. A malicious or poorly written script could potentially read information displayed on a website, modify webpage content, or perform unwanted actions.

For this reason, don’t install scripts simply because they appear in search results or are recommended by an unknown website.

Before installing a script, consider the following:

Use a reputable source. Look for established userscript repositories or a developer you trust.
Check the script’s code. If you understand JavaScript, review what the script actually does.
Review permissions. Pay attention to which websites the script is configured to access.
Read user feedback. Comments, ratings, and reports can reveal potential problems.
Avoid suspicious scripts. Be particularly cautious with scripts that request unnecessary access or contain unfamiliar external requests.
Keep Tampermonkey updated. Browser extensions and userscript managers should be kept current.

In short, Tampermonkey can be used safely, but you should treat userscripts as executable code and only install scripts from sources you trust.

3. How to Use a Tampermonkey Script on a Website?

Install Tampermonkey for your browser and open its dashboard.
Find a trusted userscript that supports the website you want to customize.
Install the script and review its code and permissions before confirming.
Make sure the script is enabled in the Tampermonkey dashboard.
Open or refresh the target website. The script should run automatically if the URL matches its settings.
Use the added features according to the script’s instructions.

4. How to Resolve Tampermonkey Not Working?

If a Tampermonkey script isn’t working, try these troubleshooting methods.

1) Make Sure the Script Is Enabled

Open the Tampermonkey dashboard and check whether the script is enabled. A disabled script won’t run even if everything else is configured correctly.

2) Check the Website Match Rules

Look at the script’s @match and @include settings. Make sure they cover the exact website and URL where you want to use the script.

For example, a script configured for:

https://example.com/*

may not automatically work on an entirely different domain.

3) Refresh the Webpage

After installing or changing a userscript, reload the target webpage. Some scripts only initialize when the page loads.

You can also close the tab and open the website again.

4) Check for Browser Extension Conflicts

Other browser extensions may interfere with a userscript. Ad blockers, privacy extensions, page customization tools, and other script managers can sometimes affect how webpages are modified.

Try temporarily disabling other relevant extensions to determine whether there is a conflict.

5) Update the Userscript

Check whether the script has a newer version. If the website has recently changed its design or functionality, the script may need to be updated by its developer.

6) Check the Browser Console

If you have some technical knowledge, open your browser’s Developer Tools and check the Console tab for JavaScript errors.

An error message can help identify whether the script itself is failing or whether the webpage has changed.

7. Reinstall the Script

If the problem continues, remove the userscript from Tampermonkey and install a fresh copy from its original trusted source. This can help if the script installation or configuration has become corrupted.

8) Check Whether the Website Changed

Sometimes there is nothing wrong with Tampermonkey. The website itself may have changed its HTML structure, JavaScript, URLs, or security policies. In this situation, the userscript may need to be modified or updated before it can work again.

5. Conclusion

Tampermonkey makes it easy to customize websites and automate certain tasks with userscripts. By installing a trusted script, enabling it, and ensuring it matches the target website, you can quickly add useful functionality to your browsing experience. If a script stops working, checking its settings, updating the script, refreshing the page, and looking for browser or website changes can often resolve the issue. Always use scripts from reliable sources and review their permissions before installing them.