I used to use Opera as my main browser. Main reason for that? Ability to customise the UI to suit my preference.
My preference (whether "you" like it or not) is to have a little icon on my buttons so it's nice and clear what pressing everything does. I find that much easier to work with.
Once I had a problem (bug) with Opera where the theme was messed up and the buttons didn't display properly. That's now what Chrome is doing; only the developers decide this is a "feature" and not a bug. Whatever you want to call it, I want my + icon back. If you want to be crazy then at least add an option in the browser settings somewhere to allow us to have our +.