It was good while it worked.
I don't know when this addon was abandoned. at this point it should be removed from here. Or kept somewhere else as an archive.
It doesn't work. It is no longer maintained. Even the homepage linked is for sale.

Installed, but does nothing. There's an icon in my menu bar that does nothing. I have no idea how exactly it's supposed to work. Emailed "support" got no reply. I realize it's free, but very disappointed.

Appeared to install but didn't work at all. Icon shows on my menu bar, but seems to be inactive. No way to perform bot checks on Twitter at all.

It's good in theory, but badly programmed:

On first installation, this extension (re)loads all open Twitter tabs and opens a new tab with a Twitter login prompt for each of them. If you have too many open, this will freeze your browser.

It also adds a button to the menu bar, but the developers didn't fill in the default empty popup when you click on it or gave it another function. That makes that symbol there completely useless.

The extension would be a lot more useful if it automatically checked tweets that stayed on screen for a second or so (to avoid polling everything when scrolling quickly). There's a JS API to do that with very low performance impact now.

Want to find if someone is a bot on Twitter almost instantly? You want this.