6 files declare their use of ImageEffectsPluginBase in Image Effects 8

Basic.php in src/Plugin/image_effects/FontSelector/Basic.php

Basic.php in src/Plugin/image_effects/ImageSelector/Basic.php

Dropdown.php in src/Plugin/image_effects/ImageSelector/Dropdown.php

Farbtastic.php in src/Plugin/image_effects/ColorSelector/Farbtastic.php

HtmlColor.php in src/Plugin/image_effects/ColorSelector/HtmlColor.php

JqueryColorPicker.php in src/Plugin/image_effects/ColorSelector/JqueryColorPicker.php