The message you're seeing is related to a Chrome extension (likely Orange Monkey) that requires Developer Mode to be enabled in Chrome to function properly. Here's how you can suppress this behavior:
Steps to Enable Developer Mode in Chrome:
Open Chrome.
In the address bar, type chrome://extensions/ and press Enter.
In the top right corner of the Extensions page, you will see a toggle for Developer mode.
Turn the Developer mode switch ON.
Once you enable Developer Mode, restart your browser or disable/enable the extension again. This should prevent the popup from appearing.
If You Don't Want Developer Mode:
If you don't want Developer Mode enabled and don't need the extension, you can also remove the extension from the same Extensions page by clicking the Remove button next to it.