github.css

 /*
The following CSS variables define colorblind-friendly styling for github.com
*/

@-moz-document domain("github.com") 
{
    /* Main color substitutions */
    :root {
       --green-subs: #648FFF;
       --green-subs-light: #8AABFF;
       --green-subs-lighter: #D5E3F9;
       --red-subs: #FFB000;
       --red-subs-light: #FFD371;
       --red-subs-lighter: #FFEEBA;
       --ibm-2: #785EF0;
       --ibm-3: #DC267F;
       --ibm-4: #FE6100;
    }

    /* GENERAL*/
    .text-green {
       color: var(--green-subs)!important;
    }

    .text-red {
       color: var(--red-subs)!important;
    }

    /* DIFF */
    .blob-code-deletion {
       background-color: var(--red-subs-lighter);
     }

    .blob-num-deletion {
       background-color: var(--red-subs-light);
    }

    .blob-code-deletion .x {
       background-color: var(--red-subs-light);
    }

    .blob-code-addition {
       background-color: var(--green-subs-lighter);
    }

    .blob-num-addition {
       background-color: var(--green-subs-light);
    }

    .blob-code-addition .x {
       background-color: var(--green-subs-light);
    }

    .diffstat-block-added {
       background-color: var(--green-subs);
    }

    .diffstat-block-deleted {
       background-color: var(--red-subs);
    }

    /* DANGER*/
    .btn-danger {
       color: var(--red-subs);
    }

    .btn-danger:hover, [open]>.btn-danger {
       background-color: var(--red-subs);
    }

    .Box--danger, .Box--danger .Box-body:last-of-type, .Box--danger .Box-row:first-of-type {
       border-color: var(--red-subs);
    }


    /* ISSURES and PULL REQUESTS*/
    .open.octicon {
       color: var(--green-subs);
    }

    .closed.octicon, .reverted.octicon {
       color: var(--red-subs);
    }

    /* INSIGHTS*/
    /* Pulse */

    .summary-stats li .octicon-issue-opened {
       color: var(--green-subs);
    }

    .summary-stats li .octicon-issue-closed {
       color: var(--red-subs);
    }

    .summary-stats li .octicon-git-branch {
       color: var(--green-subs);
    }

    .authors-and-code .insertions {
       color: var(--green-subs);
    }

    .authors-and-code .insertions {
       color: var(--green-subs);
    }

    .authors-and-code .deletions {
       color: var(--red-subs);
    }

    /* Code frequency */
    .cadd {
       color: var(--green-subs);
    }
    .code-frequency .addition {
       fill: var(--green-subs);
    }

    .cdel {
       color: var(--red-subs);
    }

    .code-frequency .deletion {
       fill: var(--red-subs);
    }
}