Quickly allows you to turn off your extensions.
And then turn them back on again.
Adds all sorts of fantastic capabilities within the Webflow designer and in the dashboard as well;
Honestly, I have not used this one. But I'm impressed with the demos. It's probably not any more powerful than Chrome's DevTools, but it sure provides a nice way to see how a site was styled.
See Performance Testing for details.
If you work with APIs and Webhooks, you'll see JSON a lot, returned in your browser. These tools format it readably.
Coming soon - not yet public. Easily grab links from SO, directly to answers and posts, to save them in your code comments.