> For the complete documentation index, see [llms.txt](https://cranford-tech.gitbook.io/charles/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cranford-tech.gitbook.io/charles/key-features/open-website-on-install-uninstall.md).

# Open website on install / uninstall

To customise the behavior of your Chrome extension during installation and uninstallation, you can comment, uncomment, or adjust lines **57** and line **62** in `background.js`. 

Commented lines will be ignored. Line **57** handle the actions upon installation, while line **62** manages the actions upon uninstallation.

**Action on install**

```javascript
// Open a page on install. comment / uncomment the lines below and replace the URL with the URL you want to open on install
chrome.runtime.onInstalled.addListener((details) => {
    if (details.reason === chrome.runtime.OnInstalledReason.INSTALL) {
        chrome.tabs.create({ url: "https://buildwithcharles.io/welcome" });
    }
});
```

**Action on uninstall**

```javascript
// // open a page on uninstall. uncomment the line below and replace the URL with the URL you want to open on uninstall
chrome.runtime.setUninstallURL("https://buildwithcharles.io/welcome");
```


---

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