I created a simple Firefox extension to show an external page in a popup. I was now wondering if it's possible to use the content from the external page to fill a field in the current tab or if this is only possible when loading the content natively.
Basically what I'm trying to do is:
- Open a webpage
- The webpage contains an input field
- Open the extension > popup appears
- Click an item inside the popup
- Use the content of the item clicked as value for a (or all) input fields in the current tab