Mark potentially botted followers in your Twitter followers list. Highlights users with the default profile picture (marked in red) and/or no description (can have some false positives, marked in orange).

twitter-potential-bots.css

/* ==UserStyle==
@name        Twitter Potential Bots
@namespace   uncenter/twitter-potential-bots
@version     1.0
@author      uncenter
@description Mark potentially botted followers in your followers list.
==/UserStyle== */

@-moz-document regexp("https:\/\/x\.com\/\w+\/followers") {
    [role="menuitem"][data-testid="removeFollower"] {
        background-color: red;
        
        * {
            color: black;
        }
    }
    div[aria-label="Timeline: Followers"] {
        /* Default profile picture */
        div[style="width: calc(100% + 4px); height: calc(100% + 4px);"]:has(div + img[src="https://abs.twimg.com/sticky/default_profile_images/default_profile_x96.png"]) {
            border: 3px solid red;
        }
        
        /* No description */
        [data-testid="UserCell"]:not(:has(> div > div > [style="text-overflow: unset; color: rgb(231, 233, 234);"])) {
            border: 3px solid orange;
        }
    }
}