Bugzilla

The problem of being able to see the bookmarks toolbar only under certain circumstances has been reported multiple times, for example we have Bug 727668 that suggests a subset of users would like to see it only on "empty" pages or even have an alternative access point, but it's likely there's also users who prefer to always see it.
A keyboard shortcut may help a bit, but it's not very discoverable, and should activate keyboard navigation through bookmarks, otherwise you show the toolbar with the keyboard and then can't move through them?
A toggle button that one could customize into the toolbar may also do for mouse users.

I think we must evaluate the general problem of "Seeing the toolbar only when it's useful" and pick a direction, if we can identify a usage pattern it would be better to do it in some automated fashion, if we go the shortcut path we should ensure keyboard navigation works.

Chrome's solution is also bit puzzling, it's not discoverable, the shortcut doesn't work on the new tab page and that's surprising.
I'm also not sold on using ctrl+shift+B to go to the toolbar, because while coherent with Chrome, it would break most Firefox users that use it to go the Library.
As suggested, this is a UX problem to unwrap from scratch.

The problem of being able to see the bookmarks toolbar only under certain circumstances has been reported multiple times, for example we have Bug 727668 that suggests a subset of users would like to see it only on "empty" pages or even have an alternative access point, but it's likely there's also users who prefer to always see it.
A keyboard shortcut may help a bit, but it's not very discoverable, and should activate keyboard navigation through bookmarks, otherwise you show the toolbar with the keyboard and then can't move through them?
A toggle button that one could customize into the toolbar may also do for mouse users (though we already have a contextual menuitem)

I think we must evaluate the general problem of "Seeing the toolbar only when it's useful" and pick a direction, if we can identify a usage pattern it would be better to do it in some automated fashion, if we go the shortcut path we should ensure keyboard navigation works.

Chrome's solution is also bit puzzling, it's not discoverable, the shortcut doesn't work on the new tab page and that's surprising.
I'm also not sold on using ctrl+shift+B to go to the toolbar, because while coherent with Chrome, it would break most Firefox users that use it to go the Library.
As suggested, this is a UX problem to unwrap from scratch.