jubicode

import bpy
from mathutils import Color

bl_info = {
    'name': 'Select By Color',
    'author': 'Tamas Kemenczy, updated for 2.8 by Piotr Zgodziński',
    'version': (0, 2),
    'blender': (2, 80, 3),
    'location': 'View3D > Specials > Select By Color',
    'description': 'Select all faces with the same vertex color of the selected face',