Here’s a color palette designed with a feminine flair, predominantly featuring shades of pink that are suitable for a dark mode theme in Firefox. This palette will work well for the elements you mentioned.

json
{
  "palette_name": "Feminine Dark Mode Pink",
  "colors": [
    {
      "name": "Toolbar Color",
      "hex_code": "
                            
                            #D5006D
                        "
    },
    {
      "name": "Background Color",
      "hex_code": "
                            
                            #1C1C1E
                        "
    },
    {
      "name": "Search Bar Color",
      "hex_code": "
                            
                            #F50057
                        "
    },
    {
      "name": "Tab Highlight Color",
      "hex_code": "
                            
                            #FF4081
                        "
    },
    {
      "name": "Popup Text",
      "hex_code": "
                            
                            #FFFFFF
                        "
    },
    {
      "name": "Toolbar Icons and Text",
      "hex_code": "
                            
                            #FFC1D2
                        "
    },
    {
      "name": "Background Tab Text Color",
      "hex_code": "
                            
                            #DDDDDD
                        "
    },
    {
      "name": "Search Text",
      "hex_code": "
                            
                            #FFFFFF
                        "
    },
    {
      "name": "Popup Background",
      "hex_code": "
                            
                            #2C2C2E
                        "
    }
  ]
}

This palette combines vibrant pinks with dark shades to create a visually appealing and feminine interface for your browser.

Would you like to make any adjustments to the colors, or do you need help with anything else?