I would like to see this feature in DevTools, because currently you have to aim for the edge of the panel and resize-minimize it yourself to use a page while network requests are being collected. In chrome you can resize tools by dragging not only the edge but also free space in devtools tab panel, but it still isn't as convenient as a single click. Maybe implement it not as a double-click on an edge, but as a devtools tab clicking behaviour (minimize devtools on click on a devtool tab that is already opened), maybe as a separate button. Either way the feature would be useful

Tried to visualize how the minimize button could look like and act (sorry for Russian on the screenshots, but the idea should be clear on its own): https://imgur.com/a/iZ42nbo

Details are described under the pictures, but in short - the minimize button would just make resizing to minimum faster. For side docking it would require some changes to make DevTools react to resizing below minimum.

For me this is very important feature. Mostly I am working using many windows opened. Using Developers Tools as a separate window for each site which I need to debug is very uncomfortable.

Maybe is possible to add this feature as a Firefox Add-on? For people which need this feature it will be easy to add, and the old code can be removed from official sources. It will be compromise solution for both sides.