URL: https://gemini.google.com/app

Browser / Version: Firefox 141.0
Operating System: Mac OS X 10.15
Tested Another Browser: Yes Chrome

Problem type: Site is not usable
Description: Unable to type
Steps to Reproduce:
(Opening a bug as per https://bugzilla.mozilla.org/show_bug.cgi?id=1967510#c25)
I have attempted to paste text from a browser extension, and have noticed that calling wrappedJSObject.DataTransfer.setData causes an error.

Steps to reproduce:

1. Create a Firefox extension and run the reproduce script from https://pastebin.com/3QSPsBN7
2. Open https://gemini.google.com
3. Open the console
4. Try to paste text
5. You'll notice the following error:

TypeError: 'setData' called on an object that does not implement interface DataTransfer.

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