I wouldn't mind working on this one @jlast.

• "Blackbox/Unblackbox all files in this group" seem simple enough. You could get the contents of the directory that was right-clicked and apply blackbox to each item below them however many levels deep the file tree goes from there.

• "Blackbox/Unblackbox all files outside this group" seems a little harder in that you'd have to take note of the files in the selected group (however many levels deep) and make sure to rule them out when blackboxing all the others.

Hi there, I'd like to take this one.
I was wondering do you want to add a blackbox icon next to the folder icon if all files in the group are blackboxed as shown on this image?

Btw. I think Bug 1608312 is a duplicate of this one.

Adds 'Blackbox All' context menu item to the Sources Panel with a submenu with options for:

• Blackbox all files in this group
• Unblackbox all files in this group
• Blackbox all files outside this group
• Unblackbox all files outside this group

https://hg.mozilla.org/mozilla-central/rev/fe3297b857a5

In documenting this, I discovered that blackboxing was covered only in Set event listener breakpoints, which is too limited in scope for this feature. So I documented all the file- and folder-level context menu options of the Source List pane in the Source List section of the Debugger UI Tour.