URL: https://docs.google.com/spreadsheets/

Browser / Version: Firefox 143.0.1
Operating System: Windows 11
Tested Another Browser: Yes Chrome

Problem type: Desktop site instead of mobile site
Description: モバイルサイトではなくデスクトップサイト
Steps to Reproduce:
I’m having an issue when using Google Sheets in Firefox.
When I create a drawing shape, turn it into a button, and assign a script to it, everything works perfectly on Chromium-based browsers (Chrome, Edge, etc). But on Firefox, clicking the button just gives me:

An error occurred
Script function xxx could not be found

Running the script from the custom menu (via onOpen) works without problems.

Some things I’ve tried / confirmed:

• No execution log is recorded in GAS when the button is clicked.
• Nothing shows up in the browser console either.
• Turning off Enhanced Tracking Protection → still broken.
• Disabling all extensions → still broken.
• Troubleshooting mode → still broken.
• Happens on my friend’s Firefox as well.
• Happens on completely different spreadsheets as well.

So it seems like a consistent issue in Firefox itself.

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