> ## Documentation Index
> Fetch the complete documentation index at: https://requestly-mintlify-changelog-requestly-past-week-38456.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.
# Rules Not working
> Having trouble with your rules? Follow this step-by-step checklist to quickly identify and resolve common issues with the Requestly browser extension.
## 1. Confirm Extension Permissions
Go to `chrome://extensions/` in your browser.
Find the Requestly extension and click **Details.**
Under **Site access**, choose **"On all sites"**.
## 2. Ensure the Extension Is Enabled
Go to `chrome://extensions/`
Make sure the toggle for Requestly is **enabled** (blue).
## 3. Check If the Rule Group Is Active
Groups allow you to organize rules into logical groups and enable/disable them in one go.
Visit the Requestly dashboard.
Find the group that contains your rule.
Make sure the toggle for that group is switched **on**
## 4. Activate the Extension (If Disabled)
Locate and click the Requestly icon in your browser’s toolbar to open the menu.
Click the Requestly icon in your browser’s toolbar and find the toggle labeled "Requestly paused." Click the toggle to activate Requestly. The label will change to "Requestly running," confirming activation.
Refresh your browser page to ensure that Requestly’s rules are properly applied.
## **Common Issues by Rule Type**
> Some rule types in Requestly have specific behaviors or limitations. Here's what you need to know for each one:
### Modify API Response
**Not visible in Chrome DevTools**\
API response modifications made by Requestly don’t show up in the browser’s DevTools, but they’re still applied in the background.
**Only works with XHR/Fetch requests**\
Modify API Response **can’t modify** HTML, CSS, or other static files in the extension. For that, use the [Desktop App](https://requestly.com/downloads/desktop/).
### Modify Response Headers
Response Headers modification done by Requestly are not visible in Browsers devtool but they are actually modified.
### Delay Request
In the browser extension, delays are automatically capped to prevent performance issues. XHR/Fetch requests can be delayed up to 5,000 ms, while other resources (like JS, CSS, images) support up to 10,000 ms. For unlimited delays, switch to the Desktop App.
### Insert Script Rule
**Inline JavaScript is ignored when using the URL option**\
When you choose the **URL** method, only the external script is loaded. Any inline JavaScript written between the `