Specify colors in dropdown lists

The bookmarks dropdown list in Firefox is showing in dark mode, which makes it hard for me to read and it can also trigger a migraine (not fun).  Is this something that I can change using the config option or is it a programming task for Mozilla's development group?

Also - I have to use the search bar at the top of the screen next to the address bar or else click my dial for google search because the main search bar on the speed dial page ignores that Google is my preferred search engine.  I have disabled ALL the other search engines in the list.  It's particularly disturbing when it brings up a Russian or Chinese search engine.  There's been tons of requests to fix this.