That is not possible. Browser toolbox runs in a completely separate Firefox instance in a separate profile so there’s no way you could display it inside the “main” browser window.
IIRC, it’s a button in the ··· menu.
Its not there for me
Ah, this only applies to regular inspectors. Since you’re using a tiling WM (I think), you could probably put it next to Firefox for something similar, right?
disregard below, misunderstood question
For me it is in the same window by default. It seems you can change it by clicking the three-dot menu and selecting which side you want to add it to. I am attaching a screenshot (my UI is in German, so the labels will be different if yours isn’t).
Its not there for me
What exact version are you using? My screenshot is of LibreWolf 130.0.1-1.
That is not browser toolbox - just normal devtools. Browser toolbox is separate tool which is used to inspect the browser window itself rather than web content. It’s essentially a separate Firefox instance with it’s own profile.
Ah thanks. I have never used that before, but found it now. As far as I can tell, there is no way to dock that to the window.