What fields do these areas correspond to in Firefox Color?

Hi folks! Am setting up my Firefox again after a laptop repair and finally decided to try out customising my theme. '''I am having difficulty finding the settings to tweak colours for the following''' (areas highlighted in red in image): * Sidebar background (the lighter part of it) - is this area something I can tweak from Firefox, or is it controlled by the extension's dev? * bookmarks bar text colour -- i don't see any options to modify the bookmarks toolbar in Firefox Colour. Currently it's really hard to see the text :/ * Right hand dropdown menu background and text colours -- can I tweak these? Where do I find the setting? TIA!