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?