How do I make it so my Chrome extension will only inject a script once?

Question

I'm using programmatic injection to inject my extension's code into a page only when the browser action is clicked. This is what I have on my extension's event page (per the example in the documentation): ``` chrome.browserAction.onClicked.addListener(function callback(tab){ chrome.tabs.executeScript(null, {file: "content-script.js"}); }); ``` However, the way this works, the script is injected every time the button is clicked. How can I change it so that the script is not injected on subsequent button presses - so that it is inserted only the first time the button is clicked on that page?

Accepted Answer

Put a global variable in your contentscript to judge if the contentscript has been executed.

```
if (something) { return; }
```

How do I make it so my Chrome extension will only inject a script once?

Solution

Problem