@david@pl.seahorse.sh
@m0xee Sadly I don't think there's a way to hide it, scoured the web to find a CSS hack to no avail 😢
@m0xee Actually, I found it. It’s called #star-button-box 
I was searching bookmark button like a dummy
@david
You can make one yourself, go to hamburger menu (you should unhide it first🤭) and go to More Tools → Browser Toolbox, then pick any element to wish to hide in web inspector like you do with regular web pages to find its CSS class or id.
Writing these CSS descriptors might be tricky, but nothing's impossible. This should probably do the trick:
#star-button-box {display: none !important;}
Just append it to your userChrome.css
