Why does the address bar sometimes change color in Firefox running Selenium?

Question

selenium

Why does firefox running selenium SOMETIMES change color in the address bar?



This is the same script, on the same computer, the difference is that different profiles are launched.

Previously, it seemed to me that the color always changes when launched from under the bot. but now I'm not sure at all.

Windows 10, firefox is used the most common, only it has a broken "webdriver" flag.