Someone left my Gmail in debug mode

I don’t know what’s going on with my Gmail, but I thought I’d share, since there’s some really strange things going on here, if anyone is interested. The screenshots are the bottom of this post.

The first window is what I opened my Gmail up to. Notice the “Why was the last action slow?” text at the top, under the search bar, as well as some debugging information in the lower-right under the “Details” link, and a skull icon in the lower-right corner.

When hovering over the skull icon, I’m presented with a bunch of links that don’t change my cursor to a pointing finger, but they are clickable, and I took a screenshot of each of those links.

Is this some kind of Gmail debug mode that I can’t escape from?

What I opened my Gmail to.
Clicking the skull icon in the lower-right reveals some interesting clickable links.
When I clicked the Component Spy link, this popped up.
Expanding all the items in the Component Spy.
The Data Spy, which appears to be a machine-friendly version of the folder structure.
Late Load Spy from the skull menu.
AppContext Spy from the skull menu.
When clicking “Why was this action slow?”, this is what popped up — a sort of trace through the internal structure of Gmail.
When clicking “Why was this action slow?”, this is what popped up — a sort of trace through the internal structure of Gmail.
When clicking “Why was this action slow?”, this is what popped up — a sort of trace through the internal structure of Gmail.
When clicking “Why was this action slow?”, this is what popped up — a sort of trace through the internal structure of Gmail.
When clicking “Why was this action slow?”, this is what popped up — a sort of trace through the internal structure of Gmail.