I had a look at how extensions can be created and published. Putting them together is no big deal, but you need a dev account, e.g. at the Firefox Store.

Yeah, it seems pretty easy with chrome/brave, too. But I just want to know if I'm missing any pieces. Plus I just want to learn more about extensions, in general. Also, apparently there's a need for some sort of logo. "Pretty pictures" is not really my thing. ;-)

Like a news or stock ticker?

Exactly. That's where I got the idea. I saw someone else had done an extension with a stock ticker. I definitely think that would make post promotion more valuable (if widely used).

The Steemit Dev Group could already be used for that.

Yeah, probably true. Not sure if the mods are still around, though.