Meta for the "Improve the Firefox Downloads Panel" Outreachy project. This bug will be tracking that work.
All this work will be hidden behind a pref that will be introduced in Bug 1710929, so that we have the option to turn off/on the feature if needed.
Depending on how many people are assigned to this project, an achievable subset might be limited to bug 1711049. I have provided a few pointers there.
The rest of the dependencies of this bug, at the moment, are mostly equivalent to this set of meta-bugs: