Suggestion: Theme toolbar separators

[sjain882]

I like to use customizableui-special-separatorXX to divide up my toolbar.

It's not visible in the default toolbar options, but you can use it like this: https://superuser.com/a/1248093

XX must be a unique index of your choice (01, 02, 03 each time you use a separator)

Currently, it looks like this:

Perhaps you could style it a little better, e.g, a dimmed white line with each end fading out slightly.

Also, I personally think the classic puzzle icon would be much better than an e for the extensions overflow menu, but this is subjective:

Thanks for the hard work!